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<?php $tests = ['t1', 't23', 't0', 'tt', 't2232', 't333', 't992t']; $result = []; foreach($tests as $test) { $number = preg_replace("/^t(\d+)$/", "$1", $test); if (is_numeric($number)) { $result[] = $number; } } print_r($result);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [0] => 1 [1] => 23 [2] => 0 [3] => 2232 [4] => 333 )
preferences:
258.14 ms | 404 KiB | 329 Q