Flush Links

<?php
/**
 * Plugin Name: Network Flush Rewrite Rules Button
 * Description: Adds a button to the WordPress admin bar to flush rewrite rules across all sites in a Multisite network for Editors and Administrators. Reminds to clear site cache after flushing.
 * Version: 1.0
 * Network: true
 */

add_action('admin_bar_menu', 'add_network_flush_button', 100);

/**
 * Adds a button to the WordPress admin bar if the user is an editor or administrator.
 */
function add_network_flush_button($wp_admin_bar) {
    if (!is_user_logged_in()) {
        return;
    }
    if (!current_user_can('edit_others_posts')) { // Checks if the user can edit other users' posts, common among editors and administrators
        return;
    }

    $args = array(
        'id'    => 'network-flush-rewrite',
        'title' => 'Flush Network Rewrites',
        'href'  => '#',
        'meta'  => array(
            'onclick' => 'flushNetworkRewrites();',
            'class'   => 'flush-rewrite-button',
            'title'   => 'Flush Rewrite Rules Across All Sites'
        )
    );
    $wp_admin_bar->add_node($args);
}

add_action('admin_footer', 'flush_rewrite_javascript');

/**
 * JavaScript to handle the flush action when the button is clicked.
 */
function flush_rewrite_javascript() {
    ?>
    <script type="text/javascript">
        function flushNetworkRewrites() {
            if (confirm("Are you sure you want to flush rewrite rules across all network sites? This action can affect site performance.")) {
                window.location.href = "<?php echo admin_url('admin-post.php?action=flush_network_rewrites'); ?>";
            }
        }
    </script>
    <?php
}

add_action('admin_post_flush_network_rewrites', 'handle_network_flush_rewrite');

/**
 * Handles the flush action when the button is clicked.
 */
function handle_network_flush_rewrite() {
    if (!current_user_can('edit_others_posts')) {
        wp_die('You do not have sufficient permissions to perform this action.');
    }

    flush_network_rewrite_rules(); // Assumes the function is defined in previous examples
    wp_redirect(add_query_arg(['flushed' => '1'], admin_url()));
    exit;
}

add_action('admin_notices', 'show_flush_notification');

/**
 * Shows a notification after the flush operation has been completed.
 */
function show_flush_notification() {
    if (isset($_GET['flushed']) && $_GET['flushed'] == '1') {
        echo '<div class="notice notice-success is-dismissible"><p>Flush completed. Do not forget to clear the "Site Cache".</p></div>';
    }
}

// The function flush_network_rewrite_rules is assumed to be defined in previous examples