How to go product details page from product page - php

Question

I'm trying with a E-Commerce website. But I'm having trouble. I want that when I click in the view details link of a product, the details of the product will be shown on the product_details.php page. But I can't transfer the product id to the product_details.php page.
My code is here...
<?php
include ("include/header.php");
?>
<?php
mysql_connect("localhost", "root", "") or die("problem with Connection");
mysql_select_db("finalproject");
$per_page = 3;
$pages_query = mysql_query("SELECT COUNT('product_id') FROM product");
$pages = ceil(mysql_result($pages_query, 0) / $per_page);
$page = (isset ($_GET['page'])) ? (int) $_GET['page'] : 1;
$start = ($page - 1 ) * $per_page;
$query = mysql_query("SELECT * FROM product LIMIT $start,$per_page");
while ($query_row = mysql_fetch_assoc($query))
{
echo "<b>$query_row[product_name]</b><br>";
echo "<b>Brand : </b> $query_row[product_brand] <br>";
echo "<b>Description : </b> $query_row[description] <br>";;
echo "<b>Price : </b> $query_row[price] <br>";
echo ('View details<br><br>') ;
?>
<form action="product_details.php?productId=<?php echo $row['product_id'];? >>" method="post">
<?php
}
$prev = $page - 1;
$next = $page + 1;
if (!($page <=1))
{
echo "<a href='buyproduct.php?page=$prev'>Prev</a> ";
}
if($pages >= 1)
{
for ($x=1; $x<=$pages; $x++)
{
echo ($x == $page) ? '<b>'.$x.'</b> ' : ''.$x.' ';
}
}
if (!($page >= $pages))
{
echo "<a href='buyproduct.php?page=$next'>Next</a> ";
}
?>
<?php
include ("include/footer.php");
?>
and my product_details.php is
<?php
include ("include/header.php");
?>
<?php
include ("database.php");
$productId = $_GET['productId'];
$sql = "SELECT * FROM product WHERE product_id = $productId";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result))
{
echo "<b>$row[product_name]</b><br>";
echo "<b>Brand : </b> $row[product_brand] <br>";
echo "<b>Description : </b> $row[description] <br>";;
echo "<b>Price : </b> $row[price] <br><br>";
"<br>";
}
?>
<?php
include ("include/footer.php");
?>
and when running in the browser when clicking to viw details in product_details.php the error is :
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\project2\product_details.php on line 17
Now what can I do....

Answer 1

In product_details.php the syntax of sql query is incorrect. Put $productId in quote.
The query sholu look like this..
$sql = "SELECT * FROM product WHERE product_id = '$productId'";
Hope this will help..

Answer 2

You have an error in your html...
<form action="product_details.php?productId=<?php echo $row['product_id'];? >>" method="post">
Should be...
<form action="product_details.php?productId=<?php echo $row['product_id'];?>" method="post">
Your sending an extra ">" with your product id