How can PHP be utilized to block specific referrers and redirect to an ErrorDocument in a PHP website?

To block specific referrers and redirect to an ErrorDocument in a PHP website, you can check the HTTP_REFERER header in PHP and redirect to the ErrorDocument if the referrer matches the blocked referrers. 

<?php
$blocked_referrers = array("blockedreferrer.com", "anotherblockedreferrer.com");

if (in_array($_SERVER['HTTP_REFERER'], $blocked_referrers)) {
    header("Location: /error.html");
    exit();
}
?>

Keywords

PHP referrers redirect ErrorDocument website

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