php - Unindentified index and use of unindentified constant -


this question has answer here:

notice: undefined index: qty in c:\xampp\htdocs\ecommerce\cart.php on line 130

notice: use of undefined constant qty - assumed 'qty' in c:\xampp\htdocs\ecommerce\cart.php on line 137

<?php if(isset($_post['update_cart'])){ //line 128       $qty =$_post['qty'];       $update_qty ="update cart set qty='$qty'";      $run_qty =mysqli_query($con, $update_qty);       $_session ['qty']=$qty;       $total=$total*qty; //line 137 } ?>

you forgot $ before qty in line 137 , seems $_post['qty'] empty

$total=$total*qty;

suppost 

$total=$total*$qty;

fixed version:

if(isset($_post['update_cart'])){      $qty =$_post['qty'];      $update_qty ="update cart set qty='$qty'";      $run_qty =mysqli_query($con, $update_qty);      $_session ['qty']=$qty;     $total=$total*&qty;  }

hope helps


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