Tokenizers/Comment: minor tweaks

Girlscouting.

* Remove an unnecessary interim variable.
* Add a comment clarifying certain code.
* Specify the array format in the `@return` tags.

src/Tokenizers/Comment.php

@@ -25,7 +25,7 @@ class Comment
      * @param string $eolChar  The EOL character to use for splitting strings.
      * @param int    $stackPtr The position of the first token in the file.
      *
-     * @return array
+     * @return array<int, array<string, string|int|array<int>>>
      */
     public function tokenizeString($string, $eolChar, $stackPtr)
     {
@@ -81,6 +81,7 @@ public function tokenizeString($string, $eolChar, $stackPtr)
         ];
 
         if ($closeTag['content'] === false) {
+            // In PHP < 8.0 substr() can return `false` instead of always returning a string.
             $closeTag['content'] = '';
         }
 
@@ -178,7 +179,7 @@ public function tokenizeString($string, $eolChar, $stackPtr)
      * @param int    $start   The position in the string to start processing.
      * @param int    $end     The position in the string to end processing.
      *
-     * @return array
+     * @return array<int, array<string, string|int>>
      */
     private function processLine($string, $eolChar, $start, $end)
     {
@@ -253,7 +254,7 @@ private function processLine($string, $eolChar, $start, $end)
      * @param int    $start  The position in the string to start processing.
      * @param int    $end    The position in the string to end processing.
      *
-     * @return array|null
+     * @return array<string, string|int>|null
      */
     private function collectWhitespace($string, $start, $end)
     {
@@ -270,14 +271,12 @@ private function collectWhitespace($string, $start, $end)
             return null;
         }
 
-        $token = [
+        return [
             'content' => $space,
             'code'    => T_DOC_COMMENT_WHITESPACE,
             'type'    => 'T_DOC_COMMENT_WHITESPACE',
         ];
 
-        return $token;
-
     }//end collectWhitespace()