3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a[] = 1; $a[] = 2; $a[] = 3; $a[] = 1; $a[] = 1; $a[] = 2; $a[] = "dog"; $acount = array_count_values($a); print_r(array_keys($acount)); var_export(array_keys($acount));
based on UWOSL
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => dog ) array ( 0 => 1, 1 => 2, 2 => 3, 3 => 'dog', )