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public function custom_create_user($user_name, $first_name, $last_name, $email_address, $user_role = 'subscriber')
{
  $user_id = username_exists( $user_name );
  
  if( $user_id != null )
	{	
		throw New Exception('Username already exists!');
	}
	
	if ( email_exists($email_address) == true )
	{
		throw new Exception('E-mail already registered');
	}

	if ( $user_role == '' )
	{
		throw new Exception('Don't create users without roles');
	}
	
	// Generate the password and create the user
	$password = wp_generate_password( 12, false );
	$user_id = wp_create_user( $user_name, $password, $email_address );
	
	// Update USER info
	wp_update_user(
		array(
		  'ID'          					=> $user_id,
		  'nickname'    					=> $email_address,
		  'first_name'  					=> $first_name,
		  'last_name'						=> $last_name
		)
	);
	
	// Set the role
	$user = new WP_User( $user_id );
	$user->set_role( $user_role );
	
	// If need to add meta data
	// Add user meta
	// add_user_meta( $user_id, 'META_DATA_KEY', 'META_KEY_VALUE');
	
	// Optional: Return user_id
  // return array('user_id' => $user_id, 'user_name' => $user_name);
}