Hallo!
I am making a simple website as practice for professional website making. However, I don't have formal instructions with the PHP language and I would really like some advice, help or suggestions for the site I am making.
Its process is working fine, however, I can't seem to remove some notice and errors which I see has no effect on the main program. I have here the code for the most troublesome parts:
I think the error is on my line 5 with the 'command' index not being defined? I just copied these codes mostly from the tutorials I've read.
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I am making a simple website as practice for professional website making. However, I don't have formal instructions with the PHP language and I would really like some advice, help or suggestions for the site I am making.
Its process is working fine, however, I can't seem to remove some notice and errors which I see has no effect on the main program. I have here the code for the most troublesome parts:
I think the error is on my line 5 with the 'command' index not being defined? I just copied these codes mostly from the tutorials I've read.

<?php
include("includes/db.php");
include("includes/functions.php");
if($_REQUEST['command']=='add' && $_REQUEST['productid']>0){
$pid=$_REQUEST['productid'];
addtocart($pid,1);
header("location:products.php");
exit();
}
?>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Products</title>
<link href="index.css" rel="stylesheet" type="text/css" />
<link rel="stylesheet" href="index.css" type="text/css" media="screen" charset="utf-8" />
<script language="javascript">
function addtocart(pid){
document.form1.productid.value=pid;
document.form1.command.value='add';
document.form1.submit();
}
</script>
</head>
<body>
<form name="form1">
<input type="hidden" name="productid" />
<input type="hidden" name="command" />
</form>
<div class="movie_box">
<?php
$result=mysql_query("select * from products") or die("select * from products"."<br/><br/>".mysql_error());
while($row=mysql_fetch_array($result)){
?>
<table align="center">
<tr>
<td>
<img src="<?php echo $row['picture']?>" />
</td>
<td width="350px">
<h4><?php echo $row['name']?></h4><br />
<?php echo $row['description']?><br />
Price:<big style="color:green"> <em>php <?php echo $row['price']?></big></em><br /><br />
<input type="button" value="Add to Cart" onclick="addtocart(<?php echo $row['serial']?>)" />
</td>
</tr>
</table>
<hr size="1" />
<?php } ?>
</div>
</body>
</html>