mysql - link syntax error using php -

i wrote basic loop in php worked wanted, trying add link cannot syntax right , examples have found syntax not work me , keep getting errors. if show me going wrong amazing. thank in advance whether able or not!

the code throwing errors is

<a href=\"addcomment.php?id="'. $row['postid'] .'\">' "add comment" '</a>"); 

and full code is.

<?php     include("connect.php"); //connect database     //create query     $get_messages_query = $db->prepare("         select * `blogposts`         order `postid` desc          limit 5         ");     //homepage should have last 5 blog posts take //last 5 entered database , put them //array      $get_messages_query->execute();     //executes query above      while($row = $get_messages_query->fetch())     {         $blog_post_history .=         '<div class="post" id="post">             <h1>'. $row['title'] .' </h1>             <h2>' . $row['author'] . '</h2>             <p>'. $row['content'] . '</p>             <a href=\"addcomment.php?id="'. $row['postid'] .'\">' "add comment" '</a>");          </div>';     }      // while loop takes info db query , puts //information in own div title andauthor having //unique heading css p content of //the blog. loop puts information in //$blog_post_history called upon in div code      //below ?> 

there problem quotes around here

$blog_post_history .=     '<div class="post" id="post">         <h1>'. $row['title'] .' </h1>         <h2>' . $row['author'] . '</h2>         <p>'. $row['content'] . '</p>         <a href="addcomment.php?id='. $row['postid'] .'">add comment</a>     </div>';