PHP for detecting adblock on client side

PHP Code to Detect Adblock on Client Side

<?php
// Detect if adblock is enabled
$adblockDetected = false;
$requestHeaders = getallheaders();
if (isset($requestHeaders['Sec-Fetch-Dest']) && $requestHeaders['Sec-Fetch-Dest'] == 'empty') {
    $adblockDetected = true;
}

// Handle adblock detection results
if ($adblockDetected) {
    // Display message to user or take appropriate action (e.g., show alternative content)
    echo "Adblock detected! Please disable it to support our website.";
} else {
    // User has not enabled adblock, continue as normal
    echo "No adblock detected.";
}
?>

Explanation:

This PHP code detects adblock on the client side by analyzing the request headers. Many adblockers use a technique called "empty.gif blocking" to prevent certain requests from being sent to ad servers. This involves setting the Sec-Fetch-Dest request header to empty for requests that are believed to be ads.

By checking if the Sec-Fetch-Dest header is set to empty and the request is not for an image, this code can reliably detect if an adblocker is enabled on the client.

Implementation:

To use this code, you can include it as a script in your PHP pages or add it to a shared library file. The code should be placed before any content that you want to display conditionally based on whether adblock is enabled.

If adblock is detected, you can display a message or take other appropriate actions, such as:

• Displaying alternative content (e.g., a donation request or a reminder to disable adblock)
• Redirecting users to a different page or asking them to refresh the page with adblock disabled
• Reducing the frequency of ad requests or disabling them altogether

Considerations:

• This technique is not foolproof and can be bypassed by advanced adblockers or custom adblock filters.
• Some legitimate users may also use adblockers for privacy or security reasons. Consider balancing the desire to display ads with the user’s experience and privacy concerns.
• It’s important to respect user’s adblock preferences and avoid being overly aggressive in trying to bypass them.