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<?php

/*
 * Hide WPMU DEV plugin banner messages from WP Admin Dashboard
 */
function hide_wpmudev_ads(){
        if ( is_admin() ) {
            echo '
                <style type="text/css">
                  div#message.wpmudev-message.wpdv-connect {
                      display:none;
                  }
                </style>
            ';
        }
}
add_action('admin_head', 'hide_wpmudev_ads');