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run code in 300+ PHP versions simultaneously
<?php $array1 = array("id1" => "value1","id3" => "value6"); $array2 = array("id2" => "value2", "id3" => "value3", "id4" => "value4"); $array3 = array_merge($array2, $array1/*, $arrayN, $arrayN*/); $array4 = $array1 + $array2; echo '<pre>'; var_dump($array3); var_dump($array4); echo '</pre>';
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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
<pre>array(4) { ["id2"]=> string(6) "value2" ["id3"]=> string(6) "value6" ["id4"]=> string(6) "value4" ["id1"]=> string(6) "value1" } array(4) { ["id1"]=> string(6) "value1" ["id3"]=> string(6) "value6" ["id2"]=> string(6) "value2" ["id4"]=> string(6) "value4" } </pre>

preferences:
283.19 ms | 406 KiB | 460 Q