How can you prevent a specific external website, such as the W3C validator, from incrementing the PHP counter on your website?

To prevent a specific external website, such as the W3C validator, from incrementing the PHP counter on your website, you can check the referrer of the incoming request and only increment the counter if the referrer is not from the specific website. This can be achieved by using the $_SERVER['HTTP_REFERER'] variable in PHP to get the referrer URL and comparing it to the URL of the specific website. 

<?php
$referrer = $_SERVER['HTTP_REFERER'];

// Check if the referrer is not from the specific website
if ($referrer !== 'https://validator.w3.org/') {
    // Increment the counter
    // Your counter increment code here
}
?>

Keywords

PHP external website counter prevent W3C validator

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