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Try $expected = array( '1111', '2222', '2222', '3333' ); $received = array( '1111', '2222', '3333', '3333' ); $cExp = array_count_values($expected); $cRec = array_count_values($received); foreach (array_keys($cExp+$cRec) as $prod) { $e = $cExp[$prod] ?? 0; $r = $cRec[$prod] ?? 0; switch ($e <=>$r) { case -1: $check = 'Over'; break; case 0: $check = 'OK'; break; case 1: $check = 'Under'; break; } echo $prod . " Ordered: $e Received: $r - $check <br>"; } giving 1111 Ordered: 1 Received: 1 - OK 2222 Ordered: 2 Received: 1 - Under 3333 Ordered: 1 Received: 2 - Over

The easiest way to use it is set error reporting option when you connect, plus a couple of other options. This will save you from have to test for errors after every PDO method call. const HOST = 'localhost'; const USERNAME = '????'; const PASSWORD = '????'; const DATABASE = '????'; function pdoConnect($dbname=DATABASE) { $db = new PDO("mysql:host=".HOST.";dbname=$dbname;charset=utf8",USERNAME,PASSWORD); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); return $db; } then, to connect... $pdo = pdoConnect();