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@ 2016-11-02T10:25:59Z

<?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
Performance
VLD
References
Branches

array_push: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

164.72 ms | 405 KiB | 5 Q