diff --git a/src/Sniffs/AbstractVariableSniff.php b/src/Sniffs/AbstractVariableSniff.php
index 33594fd012..48e31b2791 100644
--- a/src/Sniffs/AbstractVariableSniff.php
+++ b/src/Sniffs/AbstractVariableSniff.php
@@ -22,6 +22,29 @@ abstract class AbstractVariableSniff extends AbstractScopeSniff
 {
 
 
+    /**
+     * List of PHP Reserved variables.
+     *
+     * Used by various naming convention sniffs.
+     *
+     * @var array
+     */
+    protected $phpReservedVars = [
+        '_SERVER'              => true,
+        '_GET'                 => true,
+        '_POST'                => true,
+        '_REQUEST'             => true,
+        '_SESSION'             => true,
+        '_ENV'                 => true,
+        '_COOKIE'              => true,
+        '_FILES'               => true,
+        'GLOBALS'              => true,
+        'http_response_header' => true,
+        'HTTP_RAW_POST_DATA'   => true,
+        'php_errormsg'         => true,
+    ];
+
+
     /**
      * Constructs an AbstractVariableTest.
      */
diff --git a/src/Standards/Squiz/Sniffs/NamingConventions/ValidVariableNameSniff.php b/src/Standards/Squiz/Sniffs/NamingConventions/ValidVariableNameSniff.php
index 42cc8cd1af..fcb59a4c2f 100644
--- a/src/Standards/Squiz/Sniffs/NamingConventions/ValidVariableNameSniff.php
+++ b/src/Standards/Squiz/Sniffs/NamingConventions/ValidVariableNameSniff.php
@@ -31,23 +31,8 @@ protected function processVariable(File $phpcsFile, $stackPtr)
         $tokens  = $phpcsFile->getTokens();
         $varName = ltrim($tokens[$stackPtr]['content'], '$');
 
-        $phpReservedVars = [
-            '_SERVER',
-            '_GET',
-            '_POST',
-            '_REQUEST',
-            '_SESSION',
-            '_ENV',
-            '_COOKIE',
-            '_FILES',
-            'GLOBALS',
-            'http_response_header',
-            'HTTP_RAW_POST_DATA',
-            'php_errormsg',
-        ];
-
         // If it's a php reserved var, then its ok.
-        if (in_array($varName, $phpReservedVars) === true) {
+        if (isset($this->phpReservedVars[$varName]) === true) {
             return;
         }
 
@@ -171,25 +156,10 @@ protected function processVariableInString(File $phpcsFile, $stackPtr)
     {
         $tokens = $phpcsFile->getTokens();
 
-        $phpReservedVars = [
-            '_SERVER',
-            '_GET',
-            '_POST',
-            '_REQUEST',
-            '_SESSION',
-            '_ENV',
-            '_COOKIE',
-            '_FILES',
-            'GLOBALS',
-            'http_response_header',
-            'HTTP_RAW_POST_DATA',
-            'php_errormsg',
-        ];
-
         if (preg_match_all('|[^\\\]\${?([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)|', $tokens[$stackPtr]['content'], $matches) !== 0) {
             foreach ($matches[1] as $varName) {
                 // If it's a php reserved var, then its ok.
-                if (in_array($varName, $phpReservedVars) === true) {
+                if (isset($this->phpReservedVars[$varName]) === true) {
                     continue;
                 }
 
diff --git a/src/Standards/Zend/Sniffs/NamingConventions/ValidVariableNameSniff.php b/src/Standards/Zend/Sniffs/NamingConventions/ValidVariableNameSniff.php
index 3a89901150..360e350531 100644
--- a/src/Standards/Zend/Sniffs/NamingConventions/ValidVariableNameSniff.php
+++ b/src/Standards/Zend/Sniffs/NamingConventions/ValidVariableNameSniff.php
@@ -31,23 +31,8 @@ protected function processVariable(File $phpcsFile, $stackPtr)
         $tokens  = $phpcsFile->getTokens();
         $varName = ltrim($tokens[$stackPtr]['content'], '$');
 
-        $phpReservedVars = [
-            '_SERVER'              => true,
-            '_GET'                 => true,
-            '_POST'                => true,
-            '_REQUEST'             => true,
-            '_SESSION'             => true,
-            '_ENV'                 => true,
-            '_COOKIE'              => true,
-            '_FILES'               => true,
-            'GLOBALS'              => true,
-            'http_response_header' => true,
-            'HTTP_RAW_POST_DATA'   => true,
-            'php_errormsg'         => true,
-        ];
-
         // If it's a php reserved var, then its ok.
-        if (isset($phpReservedVars[$varName]) === true) {
+        if (isset($this->phpReservedVars[$varName]) === true) {
             return;
         }
 
@@ -183,25 +168,10 @@ protected function processVariableInString(File $phpcsFile, $stackPtr)
     {
         $tokens = $phpcsFile->getTokens();
 
-        $phpReservedVars = [
-            '_SERVER',
-            '_GET',
-            '_POST',
-            '_REQUEST',
-            '_SESSION',
-            '_ENV',
-            '_COOKIE',
-            '_FILES',
-            'GLOBALS',
-            'http_response_header',
-            'HTTP_RAW_POST_DATA',
-            'php_errormsg',
-        ];
-
         if (preg_match_all('|[^\\\]\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)|', $tokens[$stackPtr]['content'], $matches) !== 0) {
             foreach ($matches[1] as $varName) {
                 // If it's a php reserved var, then its ok.
-                if (in_array($varName, $phpReservedVars) === true) {
+                if (isset($this->phpReservedVars[$varName]) === true) {
                     continue;
                 }