3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = array ( 0 => array ( 81 => 'asses', ), 1 => array ( 9 => 'asses', ), 2 => array ( 45 => 'asses', ), 3 => array ( 22 => 'asses', ), 4 => array ( 83 => 'asses3', ), 5 => array ( 9 => 'asses', ), ); print_r(array_unique($x, SORT_REGULAR));
Output for 7.0.0 - 7.0.20, 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 ( [0] => Array ( [81] => asses ) [1] => Array ( [9] => asses ) [2] => Array ( [45] => asses ) [3] => Array ( [22] => asses ) [4] => Array ( [83] => asses3 ) )
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Array ( [0] => Array ( [81] => asses ) [1] => Array ( [9] => asses ) [2] => Array ( [45] => asses ) [3] => Array ( [22] => asses ) [4] => Array ( [83] => asses3 ) [5] => Array ( [9] => asses ) )

preferences:
229.17 ms | 403 KiB | 259 Q