3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = Array(1 => 1, 2 =>4); $array1 = Array(3 => 5); $temp = $array + $array1; print_r($temp); echo json_encode($temp);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
Array ( [1] => 1 [2] => 4 [3] => 5 ) {"1":1,"2":4,"3":5}

preferences:
115.92 ms | 1284 KiB | 4 Q