ปรึกษาเรื่องระบบตะกร้าสินค้าที่ thaicreate เคยสอนไว้ครับ

$selecteq = "SELECT * FROM equipment_rental_detail WHERE er_ID = '".$_GET['er_ID']."'";
		$selectquery = mysqli_query($connect,$selecteq);
		while($objResult3 = mysqli_fetch_array($selectquery));{
			$selecteq2 = "select * from equipment where eq_ID = '".$objResult3['eq_ID']."'";
			$selectquery2 = mysqli_query($connect,$selecteq2);
			$objResult2 = mysqli_fetch_array($selectquery2);
		$sumeq = $objResult3['eq_Qty'] + $objResult2['eqNumber'];
		echo "qty=".$objResult3['eq_Qty'];
		echo "eqNumber=".$objResult2['eqNumber'];
		echo $sumeq;
		$sqli2 = "UPDATE equipment SET eqNumber = '".$sumeq."' WHERE eq_ID = '".$objResult3['eq_ID']."'";
		$strSQLQuery = mysqli_query($connect,$sqli2);