How can PHP developers prevent issues with duplicate content on websites?

Duplicate content on websites can harm SEO rankings and confuse search engines. To prevent this issue, PHP developers can implement canonical tags in the website's header. Canonical tags inform search engines which URL should be treated as the primary one, consolidating link equity and avoiding duplicate content penalties. 

<?php
$canonical_url = "https://www.example.com/page1";
echo '<link rel="canonical" href="' . $canonical_url . '" />';
?>

Keywords

canonical tags URL parameters 301 redirects robots.txt meta tags

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