我只想对delete函数执行批量操作。我在谷歌上研究了这么多例子，但还是做不到。如果有人能帮我解决这个问题，我将不胜感激。下面是我的代码。当选择并选择“在下拉列表中删除”并单击“应用”时，不会发生任何情况。

public function get_bulk_actions(){
    $action = array(
        "delete" =>"Delete"
    );
    return $action; 
}

public function get_columns(){
    $columns = array(
        "cb"=>"<input type=\'checkbox\'/>",
        "No"=>"No",
        "Name"=>"Name",
        "Email"=>"Email",
        "Unique_Code"=>"Unique Code",
        "Created_date"=>"Created Date"
    );
        return $columns;
 }

 public function column_cb($item){
    return sprintf(\'<input type="checkbox" name="post[]" value="%s"/>\',$item[\'id\'] );
 }

public function process_bulk_action() {

// If the delete bulk action is triggered
 $action = $this->current_action();
        if( \'delete\'===$action ) {
        $delete_ids = esc_sql( $_POST[\'post\'] );
        // loop over the array of record IDs and delete them
            foreach ( $delete_ids as $did ) {
                global $wpdb;
                $wpdb->query($wpdb->prepare( "DELETE FROM mncplugin WHERE id=\'".$did."\'"));
            }

                    wp_redirect( esc_url( add_query_arg() ) );
                    exit;
                    }
}