3v4l.org

run code in 300+ PHP versions simultaneously
<?php $entry = array( 0 => 'foo', 1 => false, 2 => -1, 3 => null, 4 => '' ); var_dump(array_filter($entry)); var_dump(array_filter($entry, 'is_scalar'));
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 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(3) "foo" [2]=> int(-1) } array(4) { [0]=> string(3) "foo" [1]=> bool(false) [2]=> int(-1) [4]=> string(0) "" }

preferences:
268.45 ms | 406 KiB | 310 Q