. .

//=======================
// redirect_canonical()
//=======================
add_action( 'template_redirect', 'redirect_canonical' );
function redirect_canon() {
	if ( is_single()) {
		global $wp;
		$wp->parse_request();
		$current_url = trim( home_url( $wp->request ), "/" );
		$redirect = get_permalink();
		$surl = trim( $redirect, "/" );
		if( $current_url != $surl ) {
			wp_redirect( $redirect, 301 );
			exit;
		}
	}
}