Aggiungo in admin post list WP

<?php

/**
 * Aggiungo bottone vista elenco WP ( admin )
 *
 * @uses : remove_query_arg, wp_get_referer
 * @see: http://wordpress.stackexchange.com/questions/149143/hide-the-post-count-behind-post-views-remove-all-published-and-trashed-in-cus
 * @see: https://developer.wordpress.org/reference/functions/remove_query_arg/
 * @see: https://developer.wordpress.org/reference/functions/wp_get_referer/
 *
 * Il filtro è "views_edit-{post_type}"
 *
 * carico il mio pulsante nell'array $views
 */
add_filter('views_edit-annuncio', 'add_custom_clear_button', 10);
function add_custom_clear_button($views){
    $button  = '<a ';
    $button .= 'style="margin-right:5px" ';
    $button .= 'id="clear" ';
    $button .= 'href="'.remove_query_arg( array('fonte', 'localita', 'customer', 'performer', 'performance', 'telefono', 'email'),wp_get_referer()).'" ';
    $button .= 'class="button button-primary" ';
    $button .= '>' . __('Pulisci','safra');
    $button .= '</a>';

    $views['clear'] = $button;

    return $views;
}

/**
 * Sposto il bottone dove credo sia più indicato, non ci sono metodi più puliti per farlo
 *
 * @see : https://codex.wordpress.org/Plugin_API/Action_Reference/admin_head-(page_hook)
 *
 * L'azione è "views_edit-{post_type}"
 * Stampo javascript arbitrario per modificare il DOM a piacere
 */
add_action('admin_head-edit.php', 'move_clear_button', 10);
function move_clear_button(){
    $current_screen = get_current_screen();
    //Se mi trovo in "annunci"
    if( 'annuncio'  == $current_screen->post_type ) : ?>
        <script type="text/javascript">
            jQuery(document).ready(function($){
                $('#clear').appendTo('.tablenav.top div.alignleft.actions:not(.bulkactions)');
            });
        </script>
    <?php endif;
}