Domain Mapping + Flush Sessions

Custom Logout action.php

function logout_shortcode( $atts, $content = null, $shortcode_name = null ) {
	$defaults = array(
			'text'     => __( 'Log out' ),
			'redirect' => '',
	);

	if ( ! is_user_logged_in() ) {
		return '';
	}

	$atts = shortcode_atts( $defaults, $atts );
	$atts['redirect'] = $atts['redirect'] ? $atts['redirect'] : get_the_permalink();
	return '<a href="' . admin_url('admin-ajax.php?action=custom_logout_action') . '" >Log Out</a>';
}
add_shortcode( 'logout', 'logout_shortcode' );

add_action("wp_ajax_custom_logout_action", "custom_logout_action");

function custom_logout_action() {

    session_start();
	wp_clear_auth_cookie();

    if(isset($_COOKIE[session_name()])):
           setcookie(session_name(), '', time()-7000000, '/');
		endif;

    session_destroy();

	$current_url = $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
	wp_redirect($current_url) ;
	exit() ; 

}