php - How to sort by custom column in users section in worpdress -

i have 2 custom columns in users section in word press "store name" , " date" these 2 saved in users_meta table in db , how can show data in user admin list sorted "store name" , "date". current code till add column heading , fetching them user_meta in users section follow.

themes function.php

/* adds store name , date column user display dashboard. * * @param    $columns    array of columns displayed on user dashboard * @return           updated array of columns including zip codes. */ function theme_add_user_store_name_column( $columns ) {   $columns['store_name'] = __( 'store name', 'theme' );  $columns['date'] = __( 'date', 'theme' );  return $columns;   } // end theme_add_user_store_name_column  add_filter( 'manage_users_columns', 'theme_add_user_store_name_column' );  /** * populates store name , date column specified user's store name. * * @param    $value      empty string * @param    $column_name    name of column populate * @param    $user_id    id of user we're working * @return           store name associated user */ function theme_show_user_store_name_data( $value, $column_name, $user_id )   {   if( 'store_name' == $column_name ) {      return get_user_meta( $user_id, 'store_name', true );  }   if( 'date' == $column_name ) {     return get_user_meta( $user_id, 'date', true );  }// end if   }    // end theme_show_user_store_name_data  add_action( 'manage_users_custom_column', 'theme_show_user_store_name_data', 10, 3 ); 

use following code sort users table according custom meta field, used single column, can modify add second field well.

// register column sortable      function store_name_column_register_sortable( $columns ) {    $columns['store_name'] = 'store_name';    return $columns;   }  add_filter( 'manage_users_sortable_columns', 'store_name_column_register_sortable' ); function store_name_column_orderby( $vars ) { if ( isset( $vars['orderby'] ) && 'store_name' == $vars['orderby'] ) {     $vars = array_merge( $vars, array(     'meta_key' => 'store_name',     'orderby' => 'meta_value'    ) );  }  return $vars; } add_filter( 'request', 'store_name_column_orderby' );