PhpCsFixer\Fixer\PhpTag\FullOpeningTagFixer::fix PHP Method

    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);
    }