php notice warning id

[Hiu Ching26169588pka2]

[24-Jul-2023 07:58:29 UTC] PHP Notice:  Use of undefined constant id - assumed 'id' in

may i know what does the php notice mean

 /home/pbv3iybckwao/public_html/product.php on line 72
[24-Jul-2023 07:58:29 UTC] PHP Notice:  Undefined index: id in /home/pbv3iybckwao/public_html/product.php on line 72

[BenPleysier]

With $_GET['id'], you are trying to access a variable that comes from the URL query parameter as in product.php?id=123. When the parameter does not exist, you will get the error message.

It is better to reconstruct the code to check if the parameter exists as in

// Check if $_GET ['id'] is set
if (isset ($_GET ['id'])) {
  // Use $_GET ['id']
  $id = $_GET ['id'];
} else {
  // Handle the case when $_GET ['id'] is not set
  // For example, show an error message or redirect to another page
  echo "No id provided";
}

[Hiu Ching26169588pka2]

 

Please check if the above coding has error.

i used your method to test and really no "no id is provided"

[osgood_]

Echo the id on the product.php page after you $_GET it, assuming you are linking to that page from the page which passes the id via the url. Do you have any result.

I assume you are not trying to open the products.php page directly, which will throw the error/warning.

[Hiu Ching26169588pka2]

im figuring out the problem. 

thanks for your suggestion