rel_canonical()

rel_canonical()

Outputs rel=canonical for singular queries.

Source

function rel_canonical() {
	if ( ! is_singular() ) {
		return;
	}

	$id = get_queried_object_id();

	if ( 0 === $id ) {
		return;
	}

	$url = wp_get_canonical_url( $id );

	if ( ! empty( $url ) ) {
		echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n";
	}
}

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Uses	Description
wp_get_canonical_url()`wp-includes/link-template.php`	Returns the canonical URL for a post.
is_singular()`wp-includes/query.php`	Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types).
get_queried_object_id()`wp-includes/query.php`	Retrieves the ID of the currently queried object.
esc_url()`wp-includes/formatting.php`	Checks and cleans a URL.

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Changelog

Version	Description
4.6.0	Adjusted to use `wp_get_canonical_url()`.
2.9.0	Introduced.

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