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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('/^-?\d+$/', '-123')); var_dump(preg_match('/^-?\d+$/', '123')); var_dump(ctype_digit(0)); var_dump(ctype_digit("0")); var_dump(ctype_digit("1"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(1) bool(false) bool(true) bool(true)