Condition qui ne fonctionne pas

try{
	require_once 'sqlconnect.php';

	// cette requête vérifie l'unicité de la machine à créer
	$check = "SELECT uuid FROM devices WHERE uuid='$uuid' AND account_id='$account_id'";
	$checkreq = $bdd ->prepare($check);
	$checkreq ->execute();
	$match = $checkreq ->rowCount();
	$checkreq ->closecursor();

	echo $match;

	if($match > 1)
	{
		header("Location: $PHP_SELF");
		die("Attention doublons détectés dans la base de données");
	}

	if($match = 1)
	{
		$mod = "UPDATE devices SET ip_address='$ip_address', ssh_port='$ssh_port', vnc_port='$vnc_port', connected='$connected', last_active='$last_active' WHERE uuid='$uuid' AND account_id='$account_id'";
		$res = $bdd ->prepare($mod);
		$res ->execute();
		echo "Machine ajoutée (MAJ)";
		$res ->closecursor();
	}

	if($match = 0)
	{
		$sql = "INSERT INTO devices (ip_address,ssh_port,vnc_port,group_name,account_id,label,uuid,connected,removed,last_active,api_id) VALUES (:ip, :ssh, :vnc, :groupe, :compte, :label, :uuid, :connect, :remove, :last, :api)";
		$req = $bdd ->prepare($sql);
		$req ->execute(array(
			':ip' => $ip_address,
			':ssh' => $ssh_port,
			':vnc' => $vnc_port,
			':groupe' => $group_name,
			':compte' => $account_id,
			':label' => $label,
			':uuid' => $uuid,
			':connect' => $connected,
			':remove' => $removed,
			':last' => $last_active,
			':api' => $api_id));
		echo "Machine ajoutée (NEW)";
		$req ->closecursor();
	}
}

catch(PDOException $e){
	echo "Erreur : " . $e->getMessage();
}

?>

Machine ajoutée (MAJ)

Machine ajoutée (NEW)