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run code in 200+ php & hhvm versions
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<?php function check_successCode($code) { if (ctype_digit($code) && ((int) $code == 0)) { return true; } return false; } var_dump(check_successCode(0));
based on 0NQe5
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(false)