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Asked: 2026-06-04T16:34:50+00:00

i have a little problem while getting a value from database and post it

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i have a little problem while getting a value from database and post it to another page , heres my code . on search.php the user enter the price min and price max , then on page result.php it shows from database the name and price of the product and a link for more infos .(info.php) this 3rd page will show some additional informations based on the Id of the product shown on result.php
i tried to hide the value of Id_product from result and post it to 3rd form but doesnt work.i got an error Notice: Undefined index: id in info.php line 4

//////search.php /////

<form  method="post" action="result.php" > 
<tr> <INPUT type=text size=20 name=pricemin ><BR>  </tr>  
<tr> <INPUT type=text size=20 name=pricemax ><BR>  </tr>
<tr> <input type="submit" class="Nom" id="button" value="Valider" /></tr></form>

///////result.php //////

<?php include 'includes/connection.php';
$pricemin = $_POST['pricemin'];
$pricemax = $_POST['pricemax'];
$query = "SELECT * FROM product where price between '$pricemin' and '$pricemax'";
$result = mysql_query($query);?>
<?php if(mysql_num_rows($result) > 0)
while($products = mysql_fetch_array($result)) {?>   
<?php echo $products['name_product'] ;echo $products['price_product'] ;
echo "<a href='http://localhost/mywebsite/info.php'>More infos</a>"
?>
<form method="post" action="info.php" >
<input type="hidden" name="id" value="<?php echo $products['id_product']; ?>" />
</form><?php } ?>...

///// info.php //////

<?php
include 'includes/connection.php';
$id_product = $_POST['id'];
$query = "SELECT * FROM product where id_product='$id_product'";
$result = mysql_query($query);   ?>
<html><head><title>.. </title></head><body>
<?php 
while($products = mysql_fetch_array($result)) {?>
<h1>Product ID : <?php echo  $products['id_product'] ; ?> </h1>
<h1>Product name : <?php echo  $products['name_product'] ; ?> </h1>
<h1>Product Qt : <?php echo  $products['quantity_product'] ; ?> </h1>
<h1>Product Spec : <?php echo  $products['spec_product'] ; ?> </h1>
<?php } ?></body></html>
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1 Answer

  1. Editorial Team

    try this: 

    //////search.php /////

<form  method="post" action="result.php" > 
<tr> <INPUT type=text size=20 name=pricemin ><BR>  </tr>  
<tr> <INPUT type=text size=20 name=pricemax ><BR>  </tr>
<tr> <input type="submit" class="Nom" id="button" value="Valider" /></tr></form>

///////result.php //////

<?php include 'includes/connection.php';
$pricemin = $_POST['pricemin '];
$pricemax = $_POST['pricemax '];
$query = "SELECT * FROM product where price between '".$pricemin."' and '".$pricemax."'";
$result = mysql_query($query);

if(mysql_num_rows($result) > 0)
while($products = mysql_fetch_array($result)) {
$id = $products['id_product'];
echo $products['name_product'] ;echo $products['price_product'] ;
echo "<a href='info.php?id=";
echo $id;
echo "'>More infos</a>"
?>

<?php } ?>...

///// info.php //////

<?php
include 'includes/connection.php';
$id_product = $_GET['id'];
$query = "SELECT * FROM bien where id_product= '".$id_product."'";
$result = mysql_query($query);   ?>
<html><head><title>.. </title></head><body>
<?php 
while($products = mysql_fetch_array($result)) {?>
<h1>Product ID : <?php echo  $products['id_product'] ; ?> </h1>
<h1>Product name : <?php echo  $products['name_product'] ; ?> </h1>
<h1>Product Qt : <?php echo  $products['quantity_product'] ; ?> </h1>
<h1>Product Spec : <?php echo  $products['spec_product'] ; ?> </h1>
<?php } ?></body></html>

    this should pass ID to info.php

    Also Form will only work if you submit a button, so if you were to click a link, form will not submit unless you use a JS onsubmit function.

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