3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(mb_substitute_character(0));
Output for 8.0.0 - 8.0.22, 8.1.0 - 8.1.9
bool(true)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30
Warning: mb_substitute_character(): Unknown character in /in/FqOFj on line 3 bool(false)

preferences:
60.92 ms | 410 KiB | 5 Q