3v4l.org

run code in 300+ 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Array ( [1] => 1 [2] => 4 [3] => 5 ) {"1":1,"2":4,"3":5}

preferences:
177.8 ms | 407 KiB | 5 Q