user_displayname

В движке по умолчанию user_displayname присваивается user_fname + user_lname Помогите переделать так, чтоб user_username присваивалось user_fname + 'user_displayname' + user_lname
class_user.php

Code:

  //
	// THIS METHOD SETS A USER'S DISPLAY NAME
  //
	// INPUT:
  //    void
  //
	// OUTPUT: 
  //    void
  //
  
	function user_displayname()
  {
	  // SET DISPLAY NAME
    if( !empty($this->user_info['user_displayname']) && trim($this->user_info['user_displayname']) )
      $this->user_displayname = $this->user_info['user_displayname'];
    elseif( !empty($this->user_info['user_fname']) && !empty($this->user_info['user_lname']) && trim($this->user_info['user_fname']) && trim($this->user_info['user_lname']) )
      $this->user_info['user_displayname'] = $this->user_displayname = $this->user_info['user_fname'].' '.$this->user_info['user_lname'];
    elseif( !empty($this->user_info['user_fname']) && trim($this->user_info['user_fname']) )
      $this->user_info['user_displayname'] = $this->user_displayname = $this->user_info['user_fname'];
    elseif( !empty($this->user_info['user_lname']) && trim($this->user_info['user_lname']) )
      $this->user_info['user_displayname'] = $this->user_displayname = $this->user_info['user_lname'];
    elseif( !empty($this->user_info['user_username']) && trim($this->user_info['user_username']) )
      $this->user_info['user_displayname'] = $this->user_displayname = $this->user_info['user_username'];
    else
      $this->user_info['user_displayname'] = $this->user_displayname = $this->user_info['user_id'];
    
    $this->user_displayname_short = ( !empty($this->user_info['user_fname']) && trim($this->user_info['user_fname']) ? $this->user_info['user_fname'] : $this->user_info['user_username'] );
	}
  
  // END user_displayname() METHOD








  //
	// THIS METHOD UPDATES A USER'S DISPLAY NAME IN THE DATABASE
  //
	// INPUT:
  //    $mode   - Denotes the method used to generate the displayname
  //
	// OUTPUT: 
  //    void
  //
  
	function user_displayname_update($user_fname=NULL, $user_lname=NULL)
  {
    global $setting, $database;
    
    // Check user exists and allowed method
    if( !$this->user_exists || (!$user_fname && !$user_lname) ) return;
    
    if( empty($this->usersetting_info) ) $this->user_settings();
    
    $delimiter = '';
    $user_displayname = '';
    $user_fname = trim((string)$user_fname);
    $user_lname = trim((string)$user_lname);
    
    switch( (int)$this->usersetting_info['usersetting_displayname_method'] )
    {
      // {First name} {Last name}
      case 1:
      default:
        if( $user_fname && $user_lname ) $delimiter = ' ';
        $user_displayname = $user_fname.$delimiter.$user_lname;
      break;
      
      // {Last name} {First name}
      case 2:
        if( $user_fname && $user_lname ) $delimiter = ' ';
        $user_displayname = $user_lname.$delimiter.$user_fname;
      break;
      
      // {Last name}, {First name}
      case 3:
        if( $user_fname && $user_lname ) $delimiter = ', ';
        $user_displayname = $user_lname.$delimiter.$user_fname;
      break;
      
      // {Last name}
      case 4:
        $user_displayname = $user_lname;
      break;
      
      // {First name}
      case 5:
        $user_displayname = $user_fname;
      break;
      
      // Custom (TODO)
      case 6:
        $user_displayname = sprintf($setting['setting_displayname_method_custom'], $user_fname, $user_lname);
      break;
    }
    
    // Fallback to username or user id
    if( !$user_displayname && $user_username )
      $user_displayname = $this->user_info['user_username'];
    elseif( !$user_displayname )
      $user_displayname = $this->user_info['user_id'];
    
    // Update the current user object?
    $this->user_info['user_displayname'] = $this->user_displayname = $user_displayname;
    
    // Update database
    $sql = "UPDATE se_users SET user_displayname='".addslashes($user_displayname)."' WHERE user_id='{$this->user_info['user_id']}' LIMIT 1";
    $database->database_query($sql);
	}
  
  // END user_displayname_update() METHOD