纯代码实现wordpress后台自定义字段筛选用户

add_action('restrict_manage_users', 'filter_by_my_role');
function filter_by_my_role($which)
{
 $st = '<select name="my_role_%s" style="float:none;margin-left:10px;">
    <option value="">%s</option>%s</select>';
 $options = '<option value="需要筛选的自定义字段的值">筛选菜单显示名称</option>
    <option value="同上，多个请自行添加">同上，多个请自行添加</option>';
 $select = sprintf( $st, $which, __( '自定义筛选...' ), $options );
 echo $select;
 submit_button(__( 'Filter' ), null, $which, false);
}

add_filter('pre_get_users', 'filter_users_by_my_role_section');
function filter_users_by_my_role_section($query)
{
 global $pagenow;
 if (is_admin() && 'users.php' == $pagenow) {
  $top = $_GET['my_role_top'] ? $_GET['my_role_top'] : null;
  $bottom = $_GET['my_role_bottom'] ? $_GET['my_role_bottom'] : null;
  if (!empty($top) OR !empty($bottom))
  {
   $section = !empty($top) ? $top : $bottom;
   $meta_query = array (array (
      'key' => 'my_user_tag',//修改为你的自定义字段key
      'value' => $section,
      'compare' => 'LIKE'
   ));
   $query->set('meta_query', $meta_query);
  }
 }
}