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<?php $myArray = array('x'=>'europe','y'=>'europe','a'=>'USA','b'=>'USA','c'=>'Canada'); $newList = array(); foreach($myArray as $key => $value){ if(array_key_exists($value, $newList)) array_push($newList[$value], $key); else $newList[$value][] = $key; } print_r($newList);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [europe] => Array ( [0] => x [1] => y ) [USA] => Array ( [0] => a [1] => b ) [Canada] => Array ( [0] => c ) )

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