Display relational links for the posts adjacent to the current post for single post pages.

This is meant to be attached to actions like ‘wp_head’. Do not call this directly in plugins or theme templates.

Signature

adjacent_posts_rel_link_wp_head()

Return

(void)

Source

function adjacent_posts_rel_link_wp_head() {
	if ( ! is_single() || is_attachment() ) {
		return;
	}
	adjacent_posts_rel_link();
}
WP Trac GitHub

Link here