you can use this code.
It shows the number of products of each user, exactly what you wanted!!!
// create tab row in users page
add_filter( 'manage_users_columns', 'pre_modify_user_table' );
function pre_modify_user_table( $column ) {
$column['pCount'] = 'product count';
return $column;
}
// display user product count
add_filter( 'manage_users_custom_column', 'pre_modify_user_table_row', 10, 3 );
function pre_modify_user_table_row( $val, $column_name, $user_id ) {
switch ($column_name) {
case 'pCount' :
$args = array(
'author' => $user_id,
'post_type' => 'product'
);
$author_posts = get_posts( $args );
$val = count($author_posts);
default:
}
return $val;
}
The image shows the result:
