3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(1,2,3,1,2,3,1,2,3,4,4,5,6,4,5,6,88); $set_array = array(); foreach ($array as $value) { $set_array[$value]++; } print_r($set_array);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key 1 in /in/aGPqe on line 6 Warning: Undefined array key 2 in /in/aGPqe on line 6 Warning: Undefined array key 3 in /in/aGPqe on line 6 Warning: Undefined array key 4 in /in/aGPqe on line 6 Warning: Undefined array key 5 in /in/aGPqe on line 6 Warning: Undefined array key 6 in /in/aGPqe on line 6 Warning: Undefined array key 88 in /in/aGPqe on line 6 Array ( [1] => 3 [2] => 3 [3] => 3 [4] => 3 [5] => 2 [6] => 2 [88] => 1 )
Output for 7.4.0 - 7.4.33
Notice: Undefined offset: 1 in /in/aGPqe on line 6 Notice: Undefined offset: 2 in /in/aGPqe on line 6 Notice: Undefined offset: 3 in /in/aGPqe on line 6 Notice: Undefined offset: 4 in /in/aGPqe on line 6 Notice: Undefined offset: 5 in /in/aGPqe on line 6 Notice: Undefined offset: 6 in /in/aGPqe on line 6 Notice: Undefined offset: 88 in /in/aGPqe on line 6 Array ( [1] => 3 [2] => 3 [3] => 3 [4] => 3 [5] => 2 [6] => 2 [88] => 1 )
preferences:
132.42 ms | 402 KiB | 121 Q