What potential issue is indicated by the PHP error message "Notice: Undefined index: id" in the success.php file?

The "Notice: Undefined index: id" error in PHP indicates that the code is trying to access an array key 'id' that does not exist. To solve this issue, you can check if the 'id' index is set before trying to access it to avoid the error. This can be done using the isset() function to check if the key exists in the array before accessing its value. 

if(isset($_GET['id'])) {
    $id = $_GET['id'];
    // Rest of the code that uses the $id variable
} else {
    // Handle the case when 'id' is not set
}

Keywords

PHP error message Notice Undefined index id

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