3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [1 => 'monkey', 2 => 'giraffe', 3 => 'lion', 4 => 'walrus', 5 => 'zebra', 6 => 'narwhal']; $arr += array_splice($arr, array_search('walrus', array_keys($arr)), 1); var_export($arr);
Output for 7.2.34, 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 ( 0 => 'giraffe', 1 => 'lion', 2 => 'walrus', 3 => 'zebra', 4 => 'narwhal', )
preferences:
78.35 ms | 407 KiB | 5 Q