3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arrayFirst = [ "index" => [ 'a' => '1', ], [ 'a' => '2', ] ]; $arraySecond = [ "index" => [ 'b' => '1', ], [ 'b' => '2', ] ]; var_export( array_map( function(...$items) { return array_merge(...$items); }, $arrayFirst, $arraySecond ) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array ( 0 => array ( 'a' => '1', 'b' => '1', ), 1 => array ( 'a' => '2', 'b' => '2', ), )
preferences:
123.58 ms | 402 KiB | 121 Q