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POHow to create an online shopping cart in php
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  1. POHow to create an online shopping cart in php
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    copied!<p>I am creating a shopping cart which has four buttons continue shopping, clear cart, update cart and place order I am facing a problem with the sessions like when I press the clear cart button it shows the</p> <pre><code> undefined index cart </code></pre> <p>but the cart comes from the session and when i press the clear cart button </p> <pre><code>it unsets the session of cart </code></pre> <p>so where i am doing it wrong ? can anyone help ? here is my code</p> <pre><code>&lt;?php include("includes/db.php"); include("includes/functions.php"); if($_REQUEST['command']=='delete' &amp;&amp; $_REQUEST['pid']&gt;0){ remove_product($_REQUEST['pid']); } else if($_REQUEST['command']=='clear'){ unset($_SESSION['cart']); } else if($_REQUEST['command']=='update'){ $max=count($_SESSION['cart']); for($i=0;$i&lt;$max;$i++){ $pid=$_SESSION['cart'][$i]['productid']; $q=intval($_REQUEST['product'.$pid]); if($q&gt;0 &amp;&amp; $q&lt;=999){ $_SESSION['cart'][$i]['qty']=$q; } else{ $msg='Some proudcts not updated!, quantity must be a number between 1 and 999'; } } } ?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;Shopping Cart&lt;/title&gt; &lt;script language="javascript"&gt; function del(pid){ if(confirm('Do you really mean to delete this item')){ document.form1.pid.value=pid; document.form1.command.value='delete'; document.form1.submit(); } } function clear_cart(){ if(confirm('This will empty your shopping cart, continue?')){ document.form1.command.value='clear'; document.form1.submit(); } } function update_cart(){ document.form1.command.value='update'; document.form1.submit(); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form name="form1" method="post"&gt; &lt;input type="hidden" name="pid" /&gt; &lt;input type="hidden" name="command" /&gt; &lt;div style="margin:0px auto; width:600px;" &gt; &lt;div style="padding-bottom:10px"&gt; &lt;h1 align="center"&gt;Your Shopping Cart&lt;/h1&gt; &lt;input type="button" value="Continue Shopping" onclick="window.location='products.php'" /&gt; &lt;/div&gt; &lt;div style="color:#F00"&gt;&lt;?php echo'' ;?&gt;&lt;/div&gt; &lt;table border="0" cellpadding="5px" cellspacing="1px" style="font-family:Verdana, Geneva, sans-serif; font-size:11px; background-color:#E1E1E1" width="100%"&gt; &lt;?php if(is_array($_SESSION['cart'])){ echo '&lt;tr bgcolor="#FFFFFF" style="font-weight:bold"&gt;&lt;td&gt;Serial&lt;/td&gt;&lt;td&gt;Name&lt;/td&gt;&lt;td&gt;Price&lt;/td&gt;&lt;td&gt;Qty&lt;/td&gt;&lt;td&gt;Amount&lt;/td&gt;&lt;td&gt;Options&lt;/td&gt;&lt;/tr&gt;'; $max=count($_SESSION['cart']); for($i=0;$i&lt;$max;$i++){ $pid=$_SESSION['cart'][$i]['productid']; $q=$_SESSION['cart'][$i]['qty']; $pname=get_product_name($pid); if($q==0) continue; ?&gt; &lt;tr bgcolor="#FFFFFF"&gt;&lt;td&gt;&lt;?php echo $i+1?&gt;&lt;/td&gt;&lt;td&gt;&lt;?php echo $pname?&gt;&lt;/td&gt; &lt;td&gt;$ &lt;?php echo get_price($pid)?&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="product&lt;?php echo $pid?&gt;" value="&lt;?php echo $q?&gt;" maxlength="3" size="2" /&gt;&lt;/td&gt; &lt;td&gt;$ &lt;?php echo get_price($pid)*$q?&gt;&lt;/td&gt; &lt;td&gt;&lt;a href="javascript:del(&lt;?php echo $pid?&gt;)"&gt;Remove&lt;/a&gt;&lt;/td&gt;&lt;/tr&gt; &lt;?php } ?&gt; &lt;tr&gt;&lt;td&gt;&lt;b&gt;Order Total: $&lt;?php echo get_order_total()?&gt;&lt;/b&gt;&lt;/td&gt;&lt;td colspan="5" align="right"&gt;&lt;input type="button" value="Clear Cart" onclick="clear_cart()"&gt;&lt;input type="button" value="Update Cart" onclick="update_cart()"&gt;&lt;input type="button" value="Place Order" onclick="window.location='billing.php'"&gt;&lt;/td&gt;&lt;/tr&gt; &lt;?php } else{ echo "&lt;tr bgColor='#FFFFFF'&gt;&lt;td&gt;There are no items in your shopping cart!&lt;/td&gt;"; } ?&gt; &lt;/table&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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