<?php
$test = array("meh" => 5,
"awesome" => 3,
"is in" => 5,
"ich" => 4,
"da house" => 5);
$out = array();
foreach($test as $key=>$value)
if(array_key_exists($value, $out))
$out[$value][] = $key;
else
$out[$value] = array($key);
// Then you could do
echo implode(" ", $out[5]); // Should output "401 Authorization Required"
?>