3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'JzAwMDEyLDAxMjA1MzI4LEhOMDEyMDAwNDgzNyxZLFksTixBLFIwMDAxMiwwMTIwNTMzNSxITjAxMjAwMDQ4MzcsWSxZLE4sQSxSJw=='; $str = base64_decode($str); var_dump(strpos($str, "\n"));

preferences:
36.64 ms | 402 KiB | 5 Q