3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [2, 3, 5]; $result = []; foreach ($array as $result[$v * $v][$v] => $v); var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 4 => array ( 2 => 0, ), 9 => array ( 3 => 1, ), 25 => array ( 5 => 2, ), )

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