How to change the columns of Users to show number of Products?  

this is under 'users'

Will show how many orders that the customer bought?

How to sort users from old to new ..right now it's random

we copied the follow code into theme functions.  now the whole website down.

/*

 * Create a column. And maybe remove some of the default ones

 * @param array $columns Array of all user table columns {column ID} => {column Name} 

 */

add_filter( 'manage_users_columns', 'rudr_modify_user_table' );

function rudr_modify_user_table( $columns ) {

// unset( $columns['posts'] ); // maybe you would like to remove default columns

$columns['registration_date'] = 'Registration date'; // add new

return $columns;

}

/*

 * Fill our new column with the registration dates of the users

 * @param string $row_output text/HTML output of a table cell

 * @param string $column_id_attr column ID

 * @param int $user user ID (in fact - table row ID)

 */

add_filter( 'manage_users_custom_column', 'rudr_modify_user_table_row', 10, 3 );

function rudr_modify_user_table_row( $row_output, $column_id_attr, $user ) {

$date_format = 'j M, Y H:i';

switch ( $column_id_attr ) {

case 'registration_date' :

return date( $date_format, strtotime( get_the_author_meta( 'registered', $user ) ) );

break;

default:

}

return $row_output;

}

/*

 * Make our "Registration date" column sortable

 * @param array $columns Array of all user sortable columns {column ID} => {orderby GET-param} 

 */

add_filter( 'manage_users_sortable_columns', 'rudr_make_registered_column_sortable' );

function rudr_make_registered_column_sortable( $columns ) {

return wp_parse_args( array( 'registration_date' => 'registered' ), $columns );

}

recovered and deleted the code.