3v4l.org

run code in 300+ PHP versions simultaneously
<?php function get_numerics ($str) { preg_match('/^mom_(\d+)$/', $str, $matches); return $matches[1]; } $one = 'mom_5'; $two = 'mom_123'; $three = 'actions'; print_r(get_numerics($one)); print_r(get_numerics($two)); print_r(get_numerics($three));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
5123 Warning: Undefined array key 1 in /in/SagJX on line 5
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
5123 Notice: Undefined offset: 1 in /in/SagJX on line 5
Output for 7.3.32 - 7.3.33, 7.4.26
5123

preferences:
160.49 ms | 401 KiB | 184 Q