3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach([null, '', '0', 'abc', '1', '01', '0.1'] as $val) { var_dump($val); var_dump(is_numeric($val)); if ((int) $val) { var_dump(1); } elseif ($val) { var_dump(2); } else { var_dump(3); } }
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
NULL bool(false) int(3) string(0) "" bool(false) int(3) string(1) "0" bool(true) int(3) string(3) "abc" bool(false) int(2) string(1) "1" bool(true) int(1) string(2) "01" bool(true) int(1) string(3) "0.1" bool(true) int(2)
preferences:
62.95 ms | 407 KiB | 5 Q