Shopping Cart Script
<?php session_start(); ini_set('display_errors', '1'); ?> <html> <head><title>Sample</title> </head> <body> <?php if (isset($_GET['logout'])) $_SESSION=Array(); if (isset ($_GET['id']) ) registeruser(); else if (isset ($_SESSION['id']) ) returnvisit(); else firstvisit(); ?> </body> </html> <?php function registeruser(){ $_SESSION['id']=$_GET['id']; ?> <form action='sample.php' method='get'> <input type='submit' name='order' value='Place Order'> </form> <?php } function returnvisit(){ $cart = $addToCart = Array(); if (array_key_exists('qty',$_GET)) $addToCart = $_GET['qty']; if (array_key_exists('cart',$_SESSION)) $cart = $_SESSION['cart']; foreach ($addToCart as $iname=>$quantity){ if (!array_key_exists($iname,$cart))$cart[$iname]=0; $cart[$iname] += $quantity; if ($cart[$iname]<0) $cart[$iname]=0; } $_SESSION['cart'] = $cart; $inventoryfile = explode ("\n", trim(file_get_contents("inventory.dat")) ); $table = "<table border='1' width='50%'>\n<tr><th>Item Name</th><th>In Cart</th><th>Change (+/-)</th><th>Unit Price</th></tr>\n"; $total=0; foreach ($inventoryfile as $line){ list ($item, $quantity, $price) = explode (",", $line); $table.="<tr><th>$item</th><td>"; if (!array_key_exists($item,$cart)) $quantity=0; else $quantity=$cart[$item]; $table.=$quantity; $table.="</td><td><input type='text' name='qty[$item]' value=''></td><td>$price</td></tr>\n"; $total+=$price*$quantity; } $table.="<tr><th>Total</th><td colspan='2'>$total</td></tr></table>"; echo "<h1>Welcome $_SESSION[id]</h1>"; ?> <form action='sample.php' method='get'> <?php echo $table; ?> <input type='submit' name='order' value='Update Cart Contents'> </form> <a href='sample.php?logout'>Logout</a> <?php } function firstvisit(){ ?> <h1>Welcome First Time Visitor</h1> <form action='sample.php' method='get'> Your name? <input type='text' name='id' > <br> <input type='submit' name='submit'> </form> <?php } ?>