What are potential issues with using canonical tags in URLs in PHP?

Potential issues with using canonical tags in URLs in PHP include the risk of creating duplicate content issues if the canonical tag points to a different URL than the current page. To solve this, ensure that the canonical tag always points to the correct URL of the current page by dynamically generating it based on the current URL. 

<?php
$current_url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
echo "<link rel='canonical' href='$current_url' />";
?>

Keywords

canonical tags URLs PHP duplicate content SEO

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