3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ['A', 'A', 'B', 'B', 'C', 'A', 'A']; $result = []; foreach ($array as $v) { if (!isset($ref[$v])) { unset($ref); $ref[$v] = 1; $result[$v][] =& $ref[$v]; } else { ++$ref[$v]; } } var_export($result);
Output for git.master_jit, git.master
array ( 'A' => array ( 0 => 2, 1 => 2, ), 'B' => array ( 0 => 2, ), 'C' => array ( 0 => 1, ), )

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:
38.81 ms | 405 KiB | 5 Q