diff --git a/package.xml b/package.xml
index 4932f5df71..4ec06d3f57 100644
--- a/package.xml
+++ b/package.xml
@@ -109,6 +109,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
       <file baseinstalldir="" name="StableCommentWhitespaceTest.php" role="test" />
       <file baseinstalldir="" name="StableCommentWhitespaceWinTest.inc" role="test" />
       <file baseinstalldir="" name="StableCommentWhitespaceWinTest.php" role="test" />
+      <file baseinstalldir="" name="UndoNamespacedNameSingleTokenTest.inc" role="test" />
+      <file baseinstalldir="" name="UndoNamespacedNameSingleTokenTest.php" role="test" />
      </dir>
      <file baseinstalldir="" name="AbstractMethodUnitTest.php" role="test" />
      <file baseinstalldir="" name="AllTests.php" role="test" />
@@ -1979,6 +1981,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceTest.inc" name="tests/Core/Tokenizer/StableCommentWhitespaceTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceWinTest.php" name="tests/Core/Tokenizer/StableCommentWhitespaceWinTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceWinTest.inc" name="tests/Core/Tokenizer/StableCommentWhitespaceWinTest.inc" />
+   <install as="CodeSniffer/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php" name="tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php" />
+   <install as="CodeSniffer/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc" name="tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc" />
    <install as="CodeSniffer/Standards/AllSniffs.php" name="tests/Standards/AllSniffs.php" />
    <install as="CodeSniffer/Standards/AbstractSniffUnitTest.php" name="tests/Standards/AbstractSniffUnitTest.php" />
   </filelist>
@@ -2038,6 +2042,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceTest.inc" name="tests/Core/Tokenizer/StableCommentWhitespaceTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceWinTest.php" name="tests/Core/Tokenizer/StableCommentWhitespaceWinTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceWinTest.inc" name="tests/Core/Tokenizer/StableCommentWhitespaceWinTest.inc" />
+   <install as="CodeSniffer/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php" name="tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php" />
+   <install as="CodeSniffer/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc" name="tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc" />
    <install as="CodeSniffer/Standards/AllSniffs.php" name="tests/Standards/AllSniffs.php" />
    <install as="CodeSniffer/Standards/AbstractSniffUnitTest.php" name="tests/Standards/AbstractSniffUnitTest.php" />
    <ignore name="bin/phpcs.bat" />
diff --git a/src/Tokenizers/PHP.php b/src/Tokenizers/PHP.php
index 6135e957cf..3c5969ade3 100644
--- a/src/Tokenizers/PHP.php
+++ b/src/Tokenizers/PHP.php
@@ -812,6 +812,81 @@ protected function tokenize($string)
                 continue;
             }//end if
 
+            /*
+                As of PHP 8.0 fully qualified, partially qualified and namespace relative
+                identifier names are tokenized differently.
+                This "undoes" the new tokenization so the tokenization will be the same in
+                in PHP 5, 7 and 8.
+            */
+
+            if (PHP_VERSION_ID >= 80000
+                && $tokenIsArray === true
+                && ($token[0] === T_NAME_QUALIFIED
+                || $token[0] === T_NAME_FULLY_QUALIFIED
+                || $token[0] === T_NAME_RELATIVE)
+            ) {
+                $name = $token[1];
+
+                if ($token[0] === T_NAME_FULLY_QUALIFIED) {
+                    $newToken            = [];
+                    $newToken['code']    = T_NS_SEPARATOR;
+                    $newToken['type']    = 'T_NS_SEPARATOR';
+                    $newToken['content'] = '\\';
+                    $finalTokens[$newStackPtr] = $newToken;
+                    ++$newStackPtr;
+
+                    $name = ltrim($name, '\\');
+                }
+
+                if ($token[0] === T_NAME_RELATIVE) {
+                    $newToken            = [];
+                    $newToken['code']    = T_NAMESPACE;
+                    $newToken['type']    = 'T_NAMESPACE';
+                    $newToken['content'] = substr($name, 0, 9);
+                    $finalTokens[$newStackPtr] = $newToken;
+                    ++$newStackPtr;
+
+                    $newToken            = [];
+                    $newToken['code']    = T_NS_SEPARATOR;
+                    $newToken['type']    = 'T_NS_SEPARATOR';
+                    $newToken['content'] = '\\';
+                    $finalTokens[$newStackPtr] = $newToken;
+                    ++$newStackPtr;
+
+                    $name = substr($name, 10);
+                }
+
+                $parts     = explode('\\', $name);
+                $partCount = count($parts);
+                $lastPart  = ($partCount - 1);
+
+                foreach ($parts as $i => $part) {
+                    $newToken            = [];
+                    $newToken['code']    = T_STRING;
+                    $newToken['type']    = 'T_STRING';
+                    $newToken['content'] = $part;
+                    $finalTokens[$newStackPtr] = $newToken;
+                    ++$newStackPtr;
+
+                    if ($i !== $lastPart) {
+                        $newToken            = [];
+                        $newToken['code']    = T_NS_SEPARATOR;
+                        $newToken['type']    = 'T_NS_SEPARATOR';
+                        $newToken['content'] = '\\';
+                        $finalTokens[$newStackPtr] = $newToken;
+                        ++$newStackPtr;
+                    }
+                }
+
+                if (PHP_CODESNIFFER_VERBOSITY > 1) {
+                    $type    = Util\Tokens::tokenName($token[0]);
+                    $content = Util\Common::prepareForOutput($token[1]);
+                    echo "\t\t* token $stackPtr split into individual tokens; was: $type => $content".PHP_EOL;
+                }
+
+                continue;
+            }//end if
+
             /*
                 Before PHP 7.0, the "yield from" was tokenized as
                 T_YIELD, T_WHITESPACE and T_STRING. So look for
@@ -1122,6 +1197,9 @@ protected function tokenize($string)
                     }
 
                     if ($tokenType === T_STRING
+                        || $tokenType === T_NAME_FULLY_QUALIFIED
+                        || $tokenType === T_NAME_RELATIVE
+                        || $tokenType === T_NAME_QUALIFIED
                         || $tokenType === T_ARRAY
                         || $tokenType === T_NS_SEPARATOR
                     ) {
@@ -1278,6 +1356,10 @@ protected function tokenize($string)
                 tokenized as T_STRING even if it appears to be a different token,
                 such as when writing code like: function default(): foo
                 so go forward and change the token type before it is processed.
+
+                Note: this should not be done for `function Level\Name` within a
+                group use statement for the PHP 8 identifier name tokens as it
+                would interfere with the re-tokenization of those.
             */
 
             if ($tokenIsArray === true
@@ -1295,7 +1377,10 @@ protected function tokenize($string)
                         }
                     }
 
-                    if ($x < $numTokens && is_array($tokens[$x]) === true) {
+                    if ($x < $numTokens
+                        && is_array($tokens[$x]) === true
+                        && $tokens[$x][0] !== T_NAME_QUALIFIED
+                    ) {
                         if (PHP_CODESNIFFER_VERBOSITY > 1) {
                             $oldType = Util\Tokens::tokenName($tokens[$x][0]);
                             echo "\t\t* token $x changed from $oldType to T_STRING".PHP_EOL;
diff --git a/src/Util/Tokens.php b/src/Util/Tokens.php
index bc3a32414a..a374735343 100644
--- a/src/Util/Tokens.php
+++ b/src/Util/Tokens.php
@@ -124,6 +124,19 @@
     define('T_FN', 'PHPCS_T_FN');
 }
 
+// Some PHP 8.0 tokens, replicated for lower versions.
+if (defined('T_NAME_QUALIFIED') === false) {
+    define('T_NAME_QUALIFIED', 'PHPCS_T_NAME_QUALIFIED');
+}
+
+if (defined('T_NAME_FULLY_QUALIFIED') === false) {
+    define('T_NAME_FULLY_QUALIFIED', 'PHPCS_T_NAME_FULLY_QUALIFIED');
+}
+
+if (defined('T_NAME_RELATIVE') === false) {
+    define('T_NAME_RELATIVE', 'PHPCS_T_NAME_RELATIVE');
+}
+
 // Tokens used for parsing doc blocks.
 define('T_DOC_COMMENT_STAR', 'PHPCS_T_DOC_COMMENT_STAR');
 define('T_DOC_COMMENT_WHITESPACE', 'PHPCS_T_DOC_COMMENT_WHITESPACE');
diff --git a/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc b/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc
new file mode 100644
index 0000000000..f64dd62321
--- /dev/null
+++ b/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.inc
@@ -0,0 +1,147 @@
+<?php
+
+/* testNamespaceDeclaration */
+namespace Package;
+
+/* testNamespaceDeclarationWithLevels */
+namespace Vendor\SubLevel\Domain;
+
+/* testUseStatement */
+use ClassName;
+
+/* testUseStatementWithLevels */
+use Vendor\Level\Domain;
+
+/* testFunctionUseStatement */
+use function function_name;
+
+/* testFunctionUseStatementWithLevels */
+use function Vendor\Level\function_in_ns;
+
+/* testConstantUseStatement */
+use const CONSTANT_NAME;
+
+/* testConstantUseStatementWithLevels */
+use const Vendor\Level\OTHER_CONSTANT;
+
+/* testMultiUseUnqualified */
+use UnqualifiedClassName,
+    /* testMultiUsePartiallyQualified */
+    Sublevel\PartiallyClassName;
+
+/* testGroupUseStatement */
+use Vendor\Level\{
+    AnotherDomain,
+    function function_grouped,
+    const CONSTANT_GROUPED,
+    Sub\YetAnotherDomain,
+    function SubLevelA\function_grouped_too,
+    const SubLevelB\CONSTANT_GROUPED_TOO,
+};
+
+/* testClassName */
+class MyClass
+    /* testExtendedFQN */
+    extends \Vendor\Level\FQN
+    /* testImplementsRelative */
+    implements namespace\Name,
+        /* testImplementsFQN */
+        \Fully\Qualified,
+        /* testImplementsUnqualified */
+        Unqualified,
+        /* testImplementsPartiallyQualified */
+        Sub\Level\Name
+{
+    /* testFunctionName */
+    public function function_name(
+        /* testTypeDeclarationRelative */
+        namespace\Name $paramA,
+
+        /* testTypeDeclarationFQN */
+        \Fully\Qualified\Name $paramB,
+
+        /* testTypeDeclarationUnqualified */
+        Unqualified $paramC,
+
+        /* testTypeDeclarationPartiallyQualified */
+        Sublevel\Name $paramD,
+
+    /* testReturnTypeFQN */
+    ) : \Name {
+
+        try {
+            /* testFunctionCallRelative */
+            echo NameSpace\function_name();
+
+            /* testFunctionCallFQN */
+            echo \Vendor\Package\function_name();
+
+            /* testFunctionCallUnqualified */
+            echo function_name();
+
+            /* testFunctionPartiallyQualified */
+            echo Level\function_name();
+
+        /* testCatchRelative */
+        } catch (namespace\SubLevel\Exception $e) {
+
+        /* testCatchFQN */
+        } catch (\Exception $e) {
+
+        /* testCatchUnqualified */
+        } catch (Exception $e) {
+
+        /* testCatchPartiallyQualified */
+        } catch (Level\Exception $e) {
+        }
+
+        /* testNewRelative */
+        $obj = new namespace\ClassName();
+
+        /* testNewFQN */
+        $obj = new \Vendor\ClassName();
+
+        /* testNewUnqualified */
+        $obj = new ClassName;
+
+        /* testNewPartiallyQualified */
+        $obj = new Level\ClassName;
+
+        /* testDoubleColonRelative */
+        $value = namespace\ClassName::property;
+
+        /* testDoubleColonFQN */
+        $value = \ClassName::static_function();
+
+        /* testDoubleColonUnqualified */
+        $value = ClassName::CONSTANT_NAME;
+
+        /* testDoubleColonPartiallyQualified */
+        $value = Level\ClassName::CONSTANT_NAME['key'];
+        
+        /* testInstanceOfRelative */
+        $is = $obj instanceof namespace\ClassName;
+
+        /* testInstanceOfFQN */
+        if ($obj instanceof \Full\ClassName) {}
+
+        /* testInstanceOfUnqualified */
+        if ($a === $b && $obj instanceof ClassName && true) {}
+
+        /* testInstanceOfPartiallyQualified */
+        $is = $obj instanceof Partially\ClassName;
+    }
+}
+
+/* testInvalidInPHP8Whitespace */
+namespace \ Sublevel
+          \ function_name();
+
+/* testInvalidInPHP8Comments */
+$value = \Fully
+    // phpcs:ignore Stnd.Cat.Sniff -- for reasons
+    \Qualified
+    /* comment */
+    \Name
+    // comment
+    :: function_name();
diff --git a/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php b/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php
new file mode 100644
index 0000000000..e9fcc53b03
--- /dev/null
+++ b/tests/Core/Tokenizer/UndoNamespacedNameSingleTokenTest.php
@@ -0,0 +1,1279 @@
+<?php
+/**
+ * Tests the tokenization of identifier names.
+ *
+ * As of PHP 8, identifier names are tokenized differently, depending on them being
+ * either fully qualified, partially qualified or relative to the current namespace.
+ *
+ * This test file safeguards that in PHPCS 3.x this new form of tokenization is "undone"
+ * and the tokenization of these identifier names is the same in all PHP versions
+ * based on how these names were tokenized in PHP 5/7.
+ *
+ * {@link https://wiki.php.net/rfc/namespaced_names_as_token}
+ * {@link https://github.com/squizlabs/PHP_CodeSniffer/issues/3041}
+ *
+ * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
+ * @copyright 2020 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests\Core\Tokenizer;
+
+use PHP_CodeSniffer\Tests\Core\AbstractMethodUnitTest;
+
+class UndoNamespacedNameSingleTokenTest extends AbstractMethodUnitTest
+{
+
+
+    /**
+     * Test that identifier names are tokenized the same across PHP versions, based on the PHP 5/7 tokenization.
+     *
+     * @param string $testMarker     The comment prefacing the test.
+     * @param array  $expectedTokens The tokenization expected.
+     *
+     * @dataProvider dataIdentifierTokenization
+     * @covers       PHP_CodeSniffer\Tokenizers\PHP::tokenize
+     *
+     * @return void
+     */
+    public function testIdentifierTokenization($testMarker, $expectedTokens)
+    {
+        $tokens     = self::$phpcsFile->getTokens();
+        $identifier = $this->getTargetToken($testMarker, constant($expectedTokens[0]['type']));
+
+        foreach ($expectedTokens as $key => $tokenInfo) {
+            $this->assertSame(constant($tokenInfo['type']), $tokens[$identifier]['code']);
+            $this->assertSame($tokenInfo['type'], $tokens[$identifier]['type']);
+            $this->assertSame($tokenInfo['content'], $tokens[$identifier]['content']);
+
+            ++$identifier;
+        }
+
+    }//end testIdentifierTokenization()
+
+
+    /**
+     * Data provider.
+     *
+     * @see testIdentifierTokenization()
+     *
+     * @return array
+     */
+    public function dataIdentifierTokenization()
+    {
+        return [
+            [
+                '/* testNamespaceDeclaration */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Package',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testNamespaceDeclarationWithLevels */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'SubLevel',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Domain',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testUseStatement */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testUseStatementWithLevels */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Domain',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionUseStatement */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionUseStatementWithLevels */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_in_ns',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testConstantUseStatement */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'const',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'CONSTANT_NAME',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testConstantUseStatementWithLevels */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'const',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'OTHER_CONSTANT',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testMultiUseUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'UnqualifiedClassName',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                ],
+            ],
+            [
+                '/* testMultiUsePartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Sublevel',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'PartiallyClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testGroupUseStatement */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_USE_GROUP',
+                        'content' => '{',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'AnotherDomain',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_grouped',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'const',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'CONSTANT_GROUPED',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Sub',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'YetAnotherDomain',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'SubLevelA',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_grouped_too',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'const',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'SubLevelB',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'CONSTANT_GROUPED_TOO',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_CLOSE_USE_GROUP',
+                        'content' => '}',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testClassName */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'MyClass',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                ],
+            ],
+            [
+                '/* testExtendedFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'FQN',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                ],
+            ],
+            [
+                '/* testImplementsRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                ],
+            ],
+            [
+                '/* testImplementsFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Fully',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Qualified',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                ],
+            ],
+            [
+                '/* testImplementsUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Unqualified',
+                    ],
+                    [
+                        'type'    => 'T_COMMA',
+                        'content' => ',',
+                    ],
+                ],
+            ],
+            [
+                '/* testImplementsPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Sub',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionName */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testTypeDeclarationRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testTypeDeclarationFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Fully',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Qualified',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testTypeDeclarationUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Unqualified',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testTypeDeclarationPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Sublevel',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testReturnTypeFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionCallRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'NameSpace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionCallFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Package',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionCallUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testFunctionPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testCatchRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'SubLevel',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Exception',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testCatchFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Exception',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testCatchUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Exception',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testCatchPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Exception',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testNewRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testNewFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Vendor',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testNewUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testNewPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testDoubleColonRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_DOUBLE_COLON',
+                        'content' => '::',
+                    ],
+                ],
+            ],
+            [
+                '/* testDoubleColonFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_DOUBLE_COLON',
+                        'content' => '::',
+                    ],
+                ],
+            ],
+            [
+                '/* testDoubleColonUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_DOUBLE_COLON',
+                        'content' => '::',
+                    ],
+                ],
+            ],
+            [
+                '/* testDoubleColonPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Level',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_DOUBLE_COLON',
+                        'content' => '::',
+                    ],
+                ],
+            ],
+            [
+                '/* testInstanceOfRelative */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testInstanceOfFQN */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Full',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_CLOSE_PARENTHESIS',
+                        'content' => ')',
+                    ],
+                ],
+            ],
+            [
+                '/* testInstanceOfUnqualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                ],
+            ],
+            [
+                '/* testInstanceOfPartiallyQualified */',
+                [
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Partially',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'ClassName',
+                    ],
+                    [
+                        'type'    => 'T_SEMICOLON',
+                        'content' => ';',
+                    ],
+                ],
+            ],
+            [
+                '/* testInvalidInPHP8Whitespace */',
+                [
+                    [
+                        'type'    => 'T_NAMESPACE',
+                        'content' => 'namespace',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Sublevel',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '          ',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => ' ',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'function_name',
+                    ],
+                    [
+                        'type'    => 'T_OPEN_PARENTHESIS',
+                        'content' => '(',
+                    ],
+                ],
+            ],
+            [
+                '/* testInvalidInPHP8Comments */',
+                [
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Fully',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_PHPCS_IGNORE',
+                        'content' => '// phpcs:ignore Stnd.Cat.Sniff -- for reasons
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Qualified',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_COMMENT',
+                        'content' => '/* comment */',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '    ',
+                    ],
+                    [
+                        'type'    => 'T_NS_SEPARATOR',
+                        'content' => '\\',
+                    ],
+                    [
+                        'type'    => 'T_STRING',
+                        'content' => 'Name',
+                    ],
+                    [
+                        'type'    => 'T_WHITESPACE',
+                        'content' => '
+',
+                    ],
+                ],
+            ],
+        ];
+
+    }//end dataIdentifierTokenization()
+
+
+}//end class