3v4l.org

run code in 300+ PHP versions simultaneously
<?php $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; $chars[1] = chr(0x1b); var_dump(bin2hex($chars));
preferences:
51.54 ms | 402 KiB | 5 Q