sql update statement from a html form doesn't execute - php

Question

<?php
//include 'includes/connectie.php';
if (isset($_GET['id'])){
$product_id=$_GET['id'];
} else {
$product_id=$_POST['id'];
}
$user = 'userID';
$pass = 'mypassword';
$dbh = new PDO( 'mysql:host=localhost;dbname=webshop', $user, $pass );
$sql = "SELECT * FROM `producten` WHERE product_id='$product_id'";
$sql_result = $dbh->query($sql);
foreach($sql_result as $row)
{
$prijs=$row['prijs'];
$product_naam=$row['product_naam'];
$product_categorie=$row['product_categorie'];
$product_specificaties=$row['product_specificaties'];
$foto=$row['foto'];
$product_id=$row['product_id'];
$product_soort=$row['product_soort'];
echo "Product id nummer:", $product_id;
}
//$_SESSION['prijs'] = $prijs;
if ($_SERVER["REQUEST_METHOD"] == "POST"){
//if (!empty($product_naam) && !empty($product_specifcaties) && !empty($product_categorie) && !empty($prijs)
//&& !empty($product_soort))
If (isset($_POST['submit']))
{
$sql = "UPDATE producten
SET prijs='$prijs', product_naam='$product_naam', product_specificaties='$product_specificaties',
product_categorie='$product_categorie', product_soort='$product_soort',
WHERE product_id='$product_id'";
$query = $dbh->prepare( $sql );
$result = $query->execute();
if ($result){
echo "Product aangepast!!!!! in id:";
echo $product_id;
} else {
echo "Product NIET aangepast!!!!";
}
}
}
?>
<form name="admin" action="producten_echt_aanpassen.php" method="POST" enctype="multipart/form-data">
<p>
<label for 'product_id'>Product ID: </label><br>
<input type="text" name="id" value="<?php print $product_id; ?>"/>
</p>
<p>
<label for 'product_naam'>Naam: </label><br>
<input type="text" name="product_naam" value="<?php print $product_naam; ?>"/>
</p>
<p> <label for 'product_specificaties'>Specificaties: </label><br>
<textarea rows= "4" cols="50" name="product_specificaties"><?php print $product_specificaties; ?>
</textarea>
</p>
<p>
<label for 'prijs'>Prijs: </label><br>
<input type="text" name="prijs" value="<?php print $prijs; ?>"/>
</p>
<p>
<label for 'product_categorie'>Iphone: </label><br>
<input type="text" name="product_categorie" value="<?php print $product_categorie; ?>"/>
</p>
<p>
<label for 'product_soort'>Soort: </label><br>
<input type="text" name="product_soort" value="<?php print $product_soort; ?>"/>
</p>
<br/>
<label for 'uploadfile'>Kies foto <img src="<?php print $foto; ?>"></label><br>
<input type="file" name="file" ><br><br>
<input type="submit" name="submit" value="Submit">
</form>
I have a form in which I load properties of products like the product name, price, photo etc. The properties are then possible to change and then updated in the database. But the sql update statement does not execute. Can anybody help me out?

Answer 1

there is a , before the where on the update that should not be there. Try to activate error reporting like this: How to get useful error messages in PHP? so that you know wwhy things are failing