mysqli_num_rows（）預計參數1被mysqli_result，布爾線285

Question

$get_list_pro = "select * from products where product_list='$list_id'"; 
$run_list_pro = mysqli_query($con, $get_list_pro); 
$count_lists = mysqli_num_rows($run_list_pro);* 

Answer 1

鑑於當你選擇查詢是錯誤發生時的錯誤。您使用select * from products where product_list='$list_id選擇的項目。不存在於表產品噸。