什么是在PHP中连接的正确方法

what is the correct way to concatenate the following to something like this "Hello John - (admin)"

      if(has_access($session_user_id, 1) === true){
         $message[] = ' - (admin!)';
       }
 ?>
<div  id="info">

 <p class="profile"> Hello <?php echo $user_data['first_name'], . echo output_messages($message) . ;?>! </p><br /><br />

Thanks!

 <p class="profile"> Hello <?php echo $user_data['first_name'] .  output_messages($message)  ;?>! </p><br /><br />