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<?php $a = new StdClass(); $b = new StdClass(); $array1 = array($a, $a, $b); $array2 = array($a, $b, $b); function countHashes ($array) { $count = array(); foreach ($array as $val) { $hash = spl_object_hash($val); if (! isset($count[$hash])) { $count[$hash] = 0; } } $count[$hash]++; return $count; }; $count1 = countHashes($array1); $count2 = countHashes($array2); if (count($count1) === count($count2)) { foreach ($count1 as $key => $value) { echo $key . " and " . $value . "\n"; if ($count2[$key] !== $value) { echo 'not the same!'; } } }