Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Rector run Failed:

{ "totals": { "changed_files": 0, "errors": 1 }, "errors": [ { "message": "System error: \"Syntax error, unexpected T_STRING, expecting ')' on line 1\"\nRun Rector with \"--debug\" option and post the report here: https://github.com/rectorphp/rector/issues/new", "file": "/var/www/storage/demo/qg6dc18ss8rzxr17cqva/rector_analyzed_file.php", "line": 319 } ] }

Run Rector on your code to see what it can do for you:

PHP snippet to change

<?php

    $result = preg_replace('/%u([a-f0-9]{4,4})/ei', 'utf8_chr(0x$1)', $_REQUEST['content']);

    function utf8_chr($num) {
      return '?';
    }

Config rector.php

<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use Rector\Php55\Rector\FuncCall\PregReplaceEModifierRector;

return RectorConfig::configure()
    ->withRules([PregReplaceEModifierRector::class]);

Rector version: 730c31 - released at 2026-02-15 20:32