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@ 2013-09-24T11:26:51Z

<?php

ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);


$arry= array("1"=>"20", "2"=>"20", "3"=>"30", "4"=>"40", "5"=>"20");

$results = array(); 
foreach($arry as $key=>$value) {
    $results[$value][] = $key;
}

var_dump($results);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
ini_set: documentation ( source)

preferences:dark modelive preview

43.09 ms | 402 KiB | 5 Q