February 11, 2011 
Definition:
function add_role( $role, $display_name, $capabilities = array() {}
Add role, if it does not exist.
Parameters
- string $role: Role name.
- string $display_name: Display name for role.
- array $capabilities: List of capabilities, e.g. array( ‘edit_posts’ => true, ‘delete_posts’ => false );
Return values
returns:WP_Role object if role is added, null if already exists.
Source code
function add_role( $role, $display_name, $capabilities = array() ) {
global $wp_roles;
if ( ! isset( $wp_roles ) )
$wp_roles = new WP_Roles();
return $wp_roles->add_role( $role, $display_name, $capabilities );
}
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A HitchHackers guide through WordPress 
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