html - how to associate child table values with parent table row and inserts child tables values corresponds to parent table row in php -


i have 2 nested tables. parent table row contains child table. both tables can add rows if needed add button. parent table values insert in product_size table in database , child table values inserts in product_color table. parent table contains sizes , child table contains color , quantity of items of size. want insert child table values(color & quantity) across parent table row. means parent first row child table values should insert across parent first row , child table values in second row of parent table should insert across parent second row. currently, code takes child table values rows of parent table , inserts in database across first row , takes child table values rows of parent table again , inserts in database across second row of parent table. please check code , me point out problem in code. /php code/

if (isset($_post['submit'])) {        $con=mysqli_connect("localhost", "root", "");     mysqli_select_db($con,"login");       ($i=0; $i<count($_post['size']); $i++){          $size = $_post['size'][$i];                    $qry1="insert product_size (product_size) values ('$size')";          $result1=mysqli_query($con,$qry1);         $product_size_id = mysqli_insert_id($con);                              ($j=0; $j<count($_post['color']); $j++){              $quantity = $_post['dress_quantity'][$j];              $color = $_post['color'][$j];              $qry2="insert product_color (product_size_id, product_color, product_quantity) values ('$product_size_id', '$color', '$quantity')";              $result2=mysqli_query($con,$qry2);              if($result2)             {                 echo '<script>alert("record added successfully!")</script>';                 echo '<script>window.location="try.php"</script>';             }             else                   {                 die("error while adding stock! please try again.");             }         }     } }

i tested on local server.work's fine

    $con=mysqli_connect("localhost", "root", "");     mysqli_select_db($con,"login");    // $size1 = array("50", "60", "70");   // $color1 =array("red", "blue", "green");   // $quantity1 = array("10", "20", "30");     ($i=0; $i<count($_post['size']); $i++){          $size = $size1[$i];             $qry1="insert product_size (product_size) values ('$size')";         $result1=mysqli_query($con,$qry1);         var_dump($result1);         echo "<br>";          $product_size_id = mysqli_insert_id($con);                              ($j=0; $j<count($size); $j++){              $quantity = $_post['dress_quantity'][$i];              $color = $_post['color'][$i];              $qry2="insert product_color (product_size_id, product_color, product_quantity) values ('$product_size_id', '$color', '$quantity')";              $result2=mysqli_query($con,$qry2);              if($result2)             {                 echo '<script>alert("record added successfully!")</script>';              //   echo '<script>window.location="try.php"</script>';             }             else                   {                 die("error while adding stock! please try again.");             }         }     }

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