3v4l.org

run code in 200+ php & hhvm versions
<?php $s = '012345'; var_dump( ord('0') !== ord($s[0]), ord('0'), ord($s[0]), ini_get('opcache.optimization_level') );
based on 1mWsb
Output for 7.3.0 - 7.4.0alpha2
bool(false) int(48) int(48) string(10) "0x7FFEBFFF"
Output for 7.1.25 - 7.2.19
bool(false) int(48) int(48) string(10) "0x7FFFBFFF"