3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = ['monkey' => 1, 'giraffe' => 2, 'lion' => 3, 'walrus' => 4, 'zebra' => 5, 'narwhal' => 6]; $arr += array_splice($arr, array_search('giraffe', array_keys($arr)), 1); var_export($arr);
Output for 5.4.0, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'monkey' => 1, 'lion' => 3, 'walrus' => 4, 'zebra' => 5, 'narwhal' => 6, 'giraffe' => 2, )
preferences:
73.99 ms | 407 KiB | 5 Q