3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump(bin2hex(mb_substr(hex2bin("8964"), 0, 1)));
Output for 8.3.2 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
string(2) "3f"
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.1
string(2) "89"
preferences:
44.26 ms | 1009 KiB | 4 Q