3v4l.org

run code in 300+ PHP versions simultaneously
<?php $numbers = [4, 3, 4, 3, 1, 2, 1]; var_export( array_keys( array_intersect( array_count_values($numbers), [1] ) ) ); echo "\n---\n"; var_export( array_keys( array_filter( array_count_values($numbers), function($count) { return $count === 1; } ) ) ); echo "\n---\n"; // PHP7.4+ var_export( array_keys( array_filter( array_count_values($numbers), fn($count) => $count === 1 ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 2, ) --- array ( 0 => 2, ) --- array ( 0 => 2, )

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
154.75 ms | 405 KiB | 5 Q