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<?php error_reporting(E_ALL); $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 for git.master, git.master_jit, rfc.property-hooks
array(3) { [20]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(5) } [30]=> array(1) { [0]=> int(3) } [40]=> array(1) { [0]=> int(4) } }

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