3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a[] = array('1',null); $a[] = array('1','2'); $a[] = array('2',null); $a[] = array('2','2'); $a[] = array('1',null); $a[] = array('2','2'); print_r(array_unique($a));
Output for 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Array ( [0] => Array ( [0] => 1 [1] => ) )
Output for hhvm-3.12.0
Notice: Array to string conversion in /in/LpFWl on line -1 Notice: Array to string conversion in /in/LpFWl on line -1 Notice: Array to string conversion in /in/LpFWl on line -1 Notice: Array to string conversion in /in/LpFWl on line -1 Notice: Array to string conversion in /in/LpFWl on line -1 Notice: Array to string conversion in /in/LpFWl on line -1 Array ( [0] => Array ( [0] => 1 [1] => ) )
Output for hhvm-3.10.0
Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Array ( [0] => Array ( [0] => 1 [1] => ) )
Output for 5.4.0 - 5.6.28
Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Notice: Array to string conversion in /in/LpFWl on line 11 Array ( [0] => Array ( [0] => 1 [1] => ) )
Output for 4.3.0 - 5.2.8, 5.2.10 - 5.3.29
Array ( [0] => Array ( [0] => 1 [1] => ) )
Output for 5.2.9
Array ( [0] => Array ( [0] => 1 [1] => ) [1] => Array ( [0] => 1 [1] => 2 ) [2] => Array ( [0] => 2 [1] => ) [3] => Array ( [0] => 2 [1] => 2 ) )