Give permission to admin to see user's page

Question

I'm writing a code for author.php . I access this by: http://example.com/author/{user_nicename} Imagine there are some users (Including 1 Admin, 4 or 5 editors, and so on ...) Now when users click on above URL, They see their own Information. I want to give permission to Admin and Editors to see the other arbitrary users Information. How can i do that? This is a part of my code in author.php :

<?php
get_header();
$user_id = get_current_user_id();
global $wpdb;
$result = $wpdb->get_results(" SELECT display_name 
                               FROM wp_introduction 
                               INNER JOIN wp_users 
                               ON costumer_id = ID 
                               WHERE $introducer_id = $user_id" );

var_dump($result);
get_sidebar();
get_footer();

?>

Answer 1

Instead of using $user_id = get_current_user_id(), you want to get the ID of the author by doing something like

$author = get_user_by( 'slug', get_query_var( 'author_name' ) );

or

if ( $author= get_query_var( 'author' ) ) { $author = get_user_by( 'id', $author_id ); }

And then use like

 $user_id = $author->ID;

Source: https://wordpress.stackexchange.com/a/35251/47406