In what situations would it be beneficial for PHP developers to use a custom function instead of relying on built-in PHP functions for extracting referrer information?

In situations where built-in PHP functions for extracting referrer information may not provide the specific functionality or customization needed, PHP developers can benefit from creating a custom function. This allows for more control over how the referrer information is extracted and processed, tailoring it to the specific requirements of the project or application.

function getReferrerInfo() {
    if(isset($_SERVER['HTTP_REFERER'])) {
        $referrer = $_SERVER['HTTP_REFERER'];
        // Custom logic for extracting and processing referrer information
        return $referrer;
    } else {
        return "No referrer information available";
    }
}

$referrerInfo = getReferrerInfo();
echo $referrerInfo;