The foreach function in php will be used for a easy way to iterate over the loop and it is only used in array and objects or It will give you an error when you try to use it on a variable with different data type.

Syntax:
   foreach(array_expression as $value)

<?php
  if (isset($_GET['id']) && isset($_GET['product']) && isset($_GET['price'])) 
	{
	 $id=$_GET['id'];
	 $Product=$_GET['product'];
	 $Price=$_GET['price'];
	$arr = array('id'=>$id,'prod'=>$Product,'price'=>$Price);
	$_SESSION['list'][]=$arr;
	header('Location:cart.php');
	}
?>

<?php 
foreach($_SESSION['list'] as $value){
	?>
	<tr>
		<td><?php echo  $value['id']; ?></td>
		<td><?php echo $value['prod']; ?> </td>
		<td><?php echo $value['price']; ?> </td>
	<tr> 
<?php }
?>

This loop gives and array_expression as a $_SESSION['name'] on every iteration, the value of the current element is assigned to $value. Every loop the value of the current element is assigned to $value. The internal array pointer is increased by one to the next element. The foreach loop runs for the all elements of an array.