Get a user’s role by user ID

From my notes, not exactly what you want but should get you there…

<?php
//list each role and each user with that role (works if logged in)
//see https://www.ads-software.com/support/topic/256436 if not logged in:
global $wp_roles;
foreach( $wp_roles->role_names as $role => $name ) {
  $name = translate_with_context($name);
  echo '<p>List of users in the role '.$role .' ('. $name . '):</p>';
  $this_role = "'[[:<:]]".$role."[[:>:]]'";
  $query = "SELECT * FROM $wpdb->users WHERE ID = ANY (SELECT user_id FROM $wpdb->usermeta WHERE meta_key = 'wp_capabilities' AND meta_value RLIKE $this_role) ORDER BY user_nicename ASC LIMIT 10000";
  $users_of_this_role = $wpdb->get_results($query);
  if ($users_of_this_role) {
    foreach($users_of_this_role as $user) {
      $curuser = get_userdata($user->ID);
      $author_post_url=get_author_posts_url($curuser->ID, $curuser->nicename);
      echo '<p>--User nicename: '.$curuser->user_nicename .', display Name: '. $curuser->display_name . ', link to author posts <a href="' . $author_post_url . '" title="' . sprintf( __( "Posts by %s" ), $curuser->user_nicename ) . '" ' . '>' . $curuser->user_nicename .'</a></p>';
    }
  }
}
?>

Yeah, that runs us into the issue of $wp_roles being empty when not logged in, which forces us to have a predefined array of roles as mentioned in the other thread.

Just a simple example for testing, which works when logged in:

<?php
	global $wp_roles;

	foreach ( $wp_roles->role_names as $role => $name ) :

		if ( current_user_can( $role ) )
			echo 'This user has a role of ' . $role;

	endforeach;
?>

So, I’m guessing the real question is how to get an array of all the user roles when not logged in.

Thanks for pointing me in the right direction. I found my answer:
https://core.trac.www.ads-software.com/attachment/ticket/5290/author-template-the_author_role.diff

Here’s the solution (assuming you have the user ID: $user_id):

<?php
	$user = get_userdata( $user_id );

	$capabilities = $user->{$wpdb->prefix . 'capabilities'};

	if ( !isset( $wp_roles ) )
		$wp_roles = new WP_Roles();

	foreach ( $wp_roles->role_names as $role => $name ) :

		if ( array_key_exists( $role, $capabilities ) )
			echo $role;

	endforeach;
?>

Thanks for this…

Now, I have another problem… I would like to display the author role on comments (like on this wordpress support site); when using this function, it show the same role for all comments ( because it’s in reality the role of the author of the commented post).
What can I do?

@greenshady: Thanks for your solution but it show me this warning everytime:
Warning: array_key_exists() [function.array-key-exists]: The second argument should be either an array or an object in E:\wamp\www\s\wp-content\themes\TBlackV2\functions.php on line 225

What’s the solution??

An even easier way to get a user’s role:

$user = new WP_User( $user_id );

if ( !empty( $user->roles ) && is_array( $user->roles ) ) {
	foreach ( $user->roles as $role )
		echo $role;
}

Just change $user_id to a specific ID.

Why are you looping through $users? Can WP_User() have multiple id’s passed at once? This works just fine for one user id:

$user = new WP_User( $user_id );
echo $user->roles[0];

Are there any problems with this?

I’m not looping through $users; I’m looping through $user->roles.

Your code will work fine assuming all your users only have a single role, which will eventually be a standard in WordPress, or if you only want to show the first role in the array. However, WordPress currently allows multiple roles per user, which I assume is the reasoning behind $user->roles being an array.

Can WP_User() have multiple id’s passed at once?

No. It only accepts a single ID.

I have this for getting the current user’s role.

I got the functionality from user-edit.php in the core.

function get_current_user_role () {
    global $current_user;
    get_currentuserinfo();
    $user_roles = $current_user->roles;
    $user_role = array_shift($user_roles);
    return $user_role;
};

@dbmartin

Cheers for this; works perfect!

well, i think the most simple way is:
on a Templates of wordpress, you can call a Function called get_currentuserinfo(); you can see it on: https://codex.www.ads-software.com/Function_Reference/get_currentuserinfo
that way:

<?php global $current_user;
      get_currentuserinfo();

      echo 'Username: ' . $current_user->user_login . "\n";
      echo 'User email: ' . $current_user->user_email . "\n";
      echo 'User level: ' . $current_user->user_level . "\n";
      echo 'User first name: ' . $current_user->user_firstname . "\n";
      echo 'User last name: ' . $current_user->user_lastname . "\n";
      echo 'User display name: ' . $current_user->display_name . "\n";
      echo 'User ID: ' . $current_user->ID . "\n";
?>

here you can see the id, or the user name.
the user level indicates the role of that user have like u see on:

https://codex.www.ads-software.com/Roles_and_Capabilities#Role_to_User_Level_Conversion
that way:

User Level 0 converts to Subscriber Role
User Level 1 converts to Contributor Role
User Level 2 converts to Author Role
User Level 3 converts to Author Role
User Level 4 converts to Author Role
User Level 5 converts to Editor Role
User Level 6 converts to Editor Role
User Level 7 converts to Editor Role
User Level 8 converts to Administrator Role
User Level 9 converts to Administrator Role
User Level 10 converts to Administrator Role

@jesus gonzalez

You’re making the assumption that everyone uses the default WP roles along with the default WP capabilities for those roles.

While it may work for some sites, the solution itself is essentially incorrect.

You should pass your user ID into this code:

$user = new WP_User( $user_id );

if ( !empty( $user->roles ) && is_array( $user->roles ) ) {
	foreach ( $user->roles as $role )
		echo $role;
}

Justin you’re a life saver… Not only I’m using the Members plugin, your login, register, profile page templates ( although with Thematic ) but now this to?

I mean… why isn’t this in the Codex?

Heck, I just subscribed to themehybrid just to say thanks. It’s the least I can do!

dbmartin, used your method, works a treat – thanks