TOGGLE WP Admin Notices

toggle_admin_notices.php

<?php
// -- Header - TOGGLE Hide Admin Notices
// -- -- ADD Script and Styling
function wm_admin_notices_toggle_script() { ?>
    <!-- JS for Admin Notices Hide -->
    <script>
        function toggle_visibility(className) {
            //alert ('you clicked it');
            elements = document.getElementsByClassName('notice');
            for (var i = 0; i < elements.length; i++) {
                elements[i].style.display = elements[i].style.display == 'block' ? 'none' : 'block';
            }
        }
    </script>
    <!-- Style for Admin Notices Hide -->
    <style>
        .notice {display:none;}
        #wpadminbar #wp-admin-bar-notices .ab-icon:before {
            content: "\f348";
        }
    </style>
    <?php }
add_action( 'admin_head', 'wm_admin_notices_toggle_script' );

// -- -- ADMIN BAR Toggle Button to show Admin Notices
    function wm_admin_notices_toggle_button( \WP_Admin_Bar $bar )
{
    $bar->add_menu( array(
        'id'     => 'notices',
        'title'  => '<span class="ab-icon"></span>'.__( 'Show Admin Notices', 'wingman-avionics' ),
        'href'   => '#',
        'meta'   => array(
            'target'   => '_self',
            'title'    => __( 'Toggle showing admin notices on off', 'wingman-avionics' ),
            'onclick' => 'toggle_visibility()'
        ),
    ) );
};
add_action( 'admin_bar_menu','wm_admin_notices_toggle_button', 910 );