$urls * @param \WP_Post|null $post Current singular post, if any. */ $urls = (array) apply_filters( 'acez_seo_hreflang_urls', array(), $post ); foreach ( $urls as $lang => $url ) { $url = esc_url( (string) $url ); if ( '' === $url ) { continue; } printf( '' . "\n", esc_attr( (string) $lang ), esc_url( $url ) ); } } }