PhpCsFixer\Tokenizer\Tokens::overrideRange PHP Method

    public function overrideRange($indexStart, $indexEnd, $items)
    {
        $oldCode = $this->generatePartialCode($indexStart, $indexEnd);
        $newCode = '';
        foreach ($items as $item) {
            $newCode .= $item->getContent();
        }
        // no changes, return
        if ($oldCode === $newCode) {
            return;
        }
        $indexToChange = $indexEnd - $indexStart + 1;
        $itemsCount = count($items);
        // If we want to add more items than passed range contains we need to
        // add placeholders for overhead items.
        if ($itemsCount > $indexToChange) {
            $placeholders = array();
            while ($itemsCount > $indexToChange) {
                $placeholders[] = new Token('__PLACEHOLDER__');
                ++$indexToChange;
            }
            $this->insertAt($indexEnd + 1, $placeholders);
        }
        // Override each items.
        foreach ($items as $itemIndex => $item) {
            $this->overrideAt($indexStart + $itemIndex, $item);
        }
        // If we want to add less tokens than passed range contains then clear
        // not needed tokens.
        if ($itemsCount < $indexToChange) {
            for ($i = $indexStart + $itemsCount; $i <= $indexEnd; ++$i) {
                $this[$i]->clear();
            }
        }
    }

 /**
  * {@inheritdoc}
  */
 public function fix(\SplFileInfo $file, Tokens $tokensOrg)
 {
     $content = $tokensOrg->generateCode();
     // replace all <? with <?php to replace all short open tags even without short_open_tag option enabled
     $newContent = preg_replace('/<\\?(\\s|$)/', '<?php$1', $content, -1, $count);
     if (!$count) {
         return;
     }
     /* the following code is magic to revert previous replacements which should NOT be replaced, for example incorrectly replacing
      * > echo '<? ';
      * with
      * > echo '<?php ';
      */
     $tokens = Tokens::fromCode($newContent);
     $tokensOldContent = '';
     $tokensOldContentLength = 0;
     foreach ($tokens as $token) {
         if ($token->isGivenKind(T_OPEN_TAG)) {
             $tokenContent = $token->getContent();
             if ('<?php' !== substr($content, $tokensOldContentLength, 5)) {
                 $tokenContent = '<? ';
             }
             $tokensOldContent .= $tokenContent;
             $tokensOldContentLength += strlen($tokenContent);
             continue;
         }
         if ($token->isGivenKind(array(T_COMMENT, T_DOC_COMMENT, T_CONSTANT_ENCAPSED_STRING, T_ENCAPSED_AND_WHITESPACE, T_STRING))) {
             $tokenContent = '';
             $tokenContentLength = 0;
             $parts = explode('<?php', $token->getContent());
             $iLast = count($parts) - 1;
             foreach ($parts as $i => $part) {
                 $tokenContent .= $part;
                 $tokenContentLength += strlen($part);
                 if ($i !== $iLast) {
                     if ('<?php' === substr($content, $tokensOldContentLength + $tokenContentLength, 5)) {
                         $tokenContent .= '<?php';
                         $tokenContentLength += 5;
                     } else {
                         $tokenContent .= '<?';
                         $tokenContentLength += 2;
                     }
                 }
             }
             $token->setContent($tokenContent);
         }
         $tokensOldContent .= $token->getContent();
         $tokensOldContentLength += strlen($token->getContent());
     }
     $tokensOrg->overrideRange(0, $tokensOrg->count() - 1, $tokens);
 }