Removing rel="canonical" in WordPress for SEO by Yoast Plugin

To remove the head record   <link rel="canonical" href="" /> when you are using the WordPress SEO by Yoast plugin, simply insert the following code into your theme's functions.php file before the closing php tag:

// Remove Canonical Link Added By Yoast WordPress SEO Plugin
function at_remove_dup_canonical_link() {
        return false;
}
add_filter( 'wpseo_canonical', 'at_remove_dup_canonical_link' );

Otherwise, you may encounter indexing problems, for example in Yandex, where many pages will be excluded by the robot due to "The document is non-canonical"