How can one prevent errors related to the Referer header in PHP?

When dealing with the Referer header in PHP, it's important to validate and sanitize the data to prevent potential security risks such as CSRF attacks. One way to prevent errors related to the Referer header is to check if the Referer header exists and matches the expected domain before processing any sensitive data. 

if(isset($_SERVER['HTTP_REFERER']) && parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST) === 'example.com'){
    // Process the data securely
} else {
    // Handle the error or redirect the user
}

Keywords

Referer header PHP error prevention security HTTP_REFERER

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