3v4l.org

run code in 500+ PHP versions simultaneously
<?php $string = 'bar'; $matches = []; preg_match('~(?|foo(*:1) |bar(*:2) |baz(*:3))~x', $string, $matches); var_dump($matches);
Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(2) { [0]=> string(3) "bar" ["MARK"]=> string(1) "2" }
preferences:
105.24 ms | 1487 KiB | 4 Q