3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_POST = array('email' => 'abc', 'phone' => '01234'); $possible = array('email', 'phone', 'foo', 'bar', 'baz'); $existing = array_intersect($possible, array_keys($_POST)); var_dump($existing);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 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 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> string(5) "email" [1]=> string(5) "phone" }
preferences:
330.18 ms | 406 KiB | 460 Q