jquery - Adding product quantity to cart in php only if product is available in cart with same color and size -

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i've created php ekart site testing purpose. query when click on add cart should firstly validate whether 1 color , 1 size selected, if both have been selected adds product cart works fine if add same product different color or size overlaps same product added , products quantity turns 1 if select product works same thing goes when select different size or color. since beginner @ php, i'm not sure going wrong here.

php code of product add cart given below:

$sql = "select * allprods listing = '$listing' ,  id = '$id'"; $data = mysql_query($sql); if (mysql_num_rows($data) == 1) {     $row = mysql_fetch_array($data);     if (isset($_session['cart'][$id]))     {         if(isset($_session['cart'][$id][$color]) && isset($_session['cart'][$id][$size]))         {             $_session['cart'][$id]['quantity']++;             echo "<script>alert('".$row['product_name']." has been added cart.');</script>";         }         else         {             $_session['cart'][$id] = array('quantity' = >1, 'price' => $row['product_special_price'], 'cat' => $cat, 'id' => $id, 'size' => $size, 'color' => $color, 'name' => $row['product_name']);             echo "<script>alert('" . $row['product_name'] . " has been added cart.');</script>";         }     }     else     {         $_session['cart'][$id] = array('quantity' => 1, 'price' => $row['product_special_price'], 'cat' => $cat, 'id' => $id, 'size' => $size, 'color' => $color, 'name' => $row['product_name']);          echo "<script>alert('" . $row['product_name'] . " has been added cart.');</script>";     } }

cart program code

<?php     if(isset($_post['qty']))     {         foreach($_post['qty'] $product_id=>$item_qty)         {             $id=(int)$product_id;             $qty=(int)$item_qty;             if($qty==0)             {                 unset($_session['cart'][$id]);             }             elseif($qty>0)             {                 $_session['cart'][$id]['quantity']=$qty;             }         }     }     else     {         echo "";     }     if(!empty($_session['cart']))     {         require "../link_db.php";         $sql="select * allprods id in(";         foreach($_session['cart'] $id=>$value)         {             $sql.=$id.',';         }         $sql=substr($sql,0,-1).') order product_id asc';          $data=mysql_query($sql);         while($row=mysql_fetch_array($data))         { ?> table row , data goes here!! <?php         }         else         { ?> <tr>     <th colspan='4' class='noprodavailablewrap'>         there no products in cart.     </th> </tr> <?php     } ?>

db structure given below: image of database structure image of database structure

use code

<?php  $sql = "select * allprods listing = '$listing' ,  id = '$id'"; $data = mysql_query($sql); if (mysql_num_rows($data) == 1) {     $row = mysql_fetch_array($data);     $index = md5($id.$color.$size);     if( isset($_session['cart'][$index]) && isset($_session['cart'][$index]['color']) && $_session['cart'][$index]['color'] == $color && isset($_session['cart'][$index]['size']) && $_session['cart'][$index]['size'] == $size){         $_session['cart'][$index]['quantity']++;         echo "<script>alert('".$row['product_name']." has been added cart.');</script>";     }else{         $_session['cart'][$index] = array('quantity' => 1, 'price' => $row['product_special_price'], 'cat' => $cat, 'id' => $id, 'size' => $size, 'color' => $color, 'name' => $row['product_name']);         echo "<script>alert('" . $row['product_name'] . " has been added cart.');</script>";     } }  ?>

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