[WordPress] すべての投稿をゴミ箱に入れたい

wp-trash_all_post.php

<?php
/***
 * Trash all post
 **/
add_action('wp_loaded','my_trash_all_posts');
function my_trash_all_posts() {
    if ( !current_user_can( 'edit_others_posts' ) )
        return;

    $nonce = isset($_POST['nonce']) ? $_POST['nonce'] : '';
    if ( isset($_POST['trash_all']) && wp_verify_nonce($nonce, 'trash_all_posts') ) {
        global $wpdb;
        $post_type = isset($_POST['post_type']) ? $_POST['post_type'] : 'post';
        $result = $wpdb->query($wpdb->prepare("
            update {$wpdb->posts}
            set post_status = 'trash'
            where post_type = %s and post_status != 'trash'",
            $post_type
        ));
        $json = json_encode(array(
            'result' => $result,
        ));
        nocache_headers();
        header( 'Content-Type: application/json; charset=' . get_bloginfo('charset') );
        echo $json;
        die();
    }
}

add_action('restrict_manage_posts', 'my_restrict_manage_posts_trash_all');
function my_restrict_manage_posts_trash_all() {
    if ( !current_user_can( 'edit_others_posts' ) )
        return;

    $post_type = isset($_REQUEST['post_type']) ? $_REQUEST['post_type'] : 'post';
    $post_status = isset($_REQUEST['post_status']) ? $_REQUEST['post_status'] : '';
    if ( $post_status !== 'trash' ) {
?>
<script type="text/javascript">
jQuery(function($){
    var $trash_all = $('<?php submit_button( '全ての投稿をゴミ箱に入れる', 'button-secondary apply', 'trash_all', false ); ?>');
    $('#post-query-submit').after($trash_all);
    $trash_all.click(function(){
        $.ajax({
            url: '<?php echo admin_url("edit.php?post_type={$post_type}");?>',
            type: 'POST',
            data: {
                trash_all: true,
                post_type: '<?php echo $post_type; ?>',
                nonce: '<?php echo wp_create_nonce('trash_all_posts'); ?>',
            },
            success: function(){
                location.href = '<?php echo admin_url("edit.php?post_status=trash&post_type={$post_type}");?>';
            },
        })
        return false;
    });
});
</script>
<?php
    }
}