Don't Send Referrer Information to Other Sites
Adds rel="noreferrer" to links in your content that point to other websites, so the sites you link to do not learn which page the visitor came from.
Opens WPIDE on
Code
// Domains that should still receive the referrer.
$wpide_referrer_allowed = array( 'amazon.com' );
add_filter( 'the_content', function ( $content ) use ( $wpide_referrer_allowed ) {
if ( false === stripos( $content, '<a' ) || ! class_exists( 'WP_HTML_Tag_Processor' ) ) {
return $content;
}
$own = wp_parse_url( home_url(), PHP_URL_HOST );
$tags = new WP_HTML_Tag_Processor( $content );
while ( $tags->next_tag( 'a' ) ) {
$host = wp_parse_url( (string) $tags->get_attribute( 'href' ), PHP_URL_HOST );
if ( ! $host || $host === $own ) {
continue;
}
foreach ( $wpide_referrer_allowed as $domain ) {
if ( $host === $domain || substr( $host, -strlen( '.' . $domain ) ) === '.' . $domain ) {
continue 2;
}
}
$rel = preg_split( '/\s+/', trim( (string) $tags->get_attribute( 'rel' ) ), -1, PREG_SPLIT_NO_EMPTY );
$rel = array_unique( array_merge( $rel, array( 'noreferrer', 'noopener' ) ) );
$tags->set_attribute( 'rel', implode( ' ', $rel ) );
}
return $tags->get_updated_html();
}, 20 );Notes
Affiliate programs that rely on the referrer to credit you may stop working; add their domains to $wpide_referrer_allowed.
How to add this snippet
- Install WPIDE on your WordPress site (it is free) and open Code Snippets.
- Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
- It is added inactive: review the code and settings, then switch it on.