3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump(bin2hex(mb_substr(hex2bin("8964"), 0, 1)));
Output for 8.3.2 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6
string(2) "3f"
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.1
string(2) "89"
preferences:
64.7 ms | 984 KiB | 4 Q