PhpCsFixer\Fixer\Whitespace\IndentationTypeFixer::fix PHP Method

    public function fix(\SplFileInfo $file, Tokens $tokens)
    {
        foreach ($tokens as $index => $token) {
            if ($token->isComment()) {
                $content = preg_replace('/^(?:(?<! ) {1,3})?\\t/m', '\\1    ', $token->getContent(), -1, $count);
                // Also check for more tabs.
                while ($count !== 0) {
                    $content = preg_replace('/^(\\ +)?\\t/m', '\\1    ', $content, -1, $count);
                }
                // change indent to expected one
                $content = preg_replace('/^    /m', $this->whitespacesConfig->getIndent(), $content);
                $tokens[$index]->setContent($content);
                continue;
            }
            if ($token->isWhitespace()) {
                // normalize mixed indent
                $content = preg_replace('/(?:(?<! ) {1,3})?\\t/', '    ', $token->getContent());
                // change indent to expected one
                $content = str_replace('    ', $this->whitespacesConfig->getIndent(), $content);
                $tokens[$index]->setContent($content);
            }
        }
    }