3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a1 = array( 'one', 'two', 'three', 'four' ); $a2 = array_diff($a1, $a1); var_dump($a2); $a2[] = 'potato'; $a2[] = 'potato'; $a2[] = 'potato'; $a2[] = 'potato'; $a3 = $a2; $a2[] = 'five'; var_dump($a2); $a3[] = 'jam'; var_dump($a3);
based on GHtnt
Output for 7.0.0 - 7.1.0
array(0) { } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(4) "five" } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(3) "jam" }
Output for 4.3.0 - 5.6.28
array(0) { } array(5) { [4]=> string(6) "potato" [5]=> string(6) "potato" [6]=> string(6) "potato" [7]=> string(6) "potato" [8]=> string(4) "five" } array(5) { [4]=> string(6) "potato" [5]=> string(6) "potato" [6]=> string(6) "potato" [7]=> string(6) "potato" [8]=> string(3) "jam" }