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@ 2014-05-04T00:14:07Z

<?php
function permutation($arr)
{
    while($ele=array_shift($arr))
    {
        $row=array($ele);

        foreach($arr as $rest)
        {
            $row[]=$rest;

        }

        if(count($row)==2) var_dump($row);
    }
}
permutation(array("1","2","3","4"));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_shift: documentation ( source)

preferences:dark modelive preview

34.94 ms | 402 KiB | 5 Q