Creating a mysql php link for the user to create a post in the forum -

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i'm trying create forum, following tutorial https://www.youtube.com/watch?v=kebwxi1bw88. i've followed succesfully untill point reason link user go , create forum post within topic not working. can see problems code or spot reason why isnt working. cant see wrong code , have followed tutorial letter.

the link within first if statement.

the link should appear on page , file create_topic.php hasnt been created yet.

 <?php session_start();?> <!doctype html> <html> <head> <meta charset="utf-8"> <title>forum</title> <link href="styles.css" rel="stylesheet" type="text/css"> <script>var __adobewebfontsappname__="dreamweaver"</script> <script src="http://use.edgefonts.net/source-sans-pro:n6:default.js" type="text/javascript"></script>  </head>  <body> <div id="wrapper">   <header id="top">     <h1>itsize</h1>     <nav id="mainnav">       <ul>         <li><a href="index.php">home</a></li>         <li><a href="fourth page.html">register</a></li>         <li><a href="second page.html">revise</a></li>         <li><a href="forum.php">forum</a></li>       </ul>     </nav>   </header>   <article id="main">   <br>   <br>  <?php   include_once("dbconnect.php");  $cid= $_get['cid'];   if (isset($_session['uid'])){      $logged= " | <a href='create_topic.php?cid=".$cid."'>click here create topic</a>";  }else{      $logged = " | please log in create topics in forum";  }   $sql = "select id categories id='".$cid."' limit 1";  $res = mysql_query($sql) or die(mysql_error());  if (mysql_num_rows($res) ==1){      $sql2 = "select * topics category_id='".$cid."' order topic_reply_date desc";      $res2 = mysql_query($sql2) or die(mysql_error());      if (mysql_num_rows($res2)>0){          $topics .= "<table width='100%' style='border-collapse: collapse;'>";          $topics .= "<tr><td colspan='3'<a href='forum.php'>return forum</a>".$logged."</td></tr>";          $topics .= "<tr style='background-colour: #dddddd;'><td>topic title</td><td width='65' align='center'>replies</td><td width='65' align='center'>views</td</tr>";          while ($row = mysql_fetch_assoc($res2)){          $tid = $row['id'];          $title = $row['topic_title'];          $views = $row['topic_views'];          $date = $row['topic_date'];          $creator =$row['topic_creator'];          $topics .= "<tr><td><a href='view_topic.php?cid=".$cid."&tid=".$tid.">".$title."</a><spa class='post_info'>posted by:".$creator." on ".$date."</span></td><td align='center'>0</td><td align='center'>".$views."</td></tr>";          $topics .="<tr><td colspan='3'></td></tr>";          }      $topics .="</table>";      }else{          echo"<p> there no topics in category yet</p><br>";      echo "<a href='forum.php'>return forum page</a><br><br>";      }  }  else{      echo"<p> trying view category not exist</p><br>";      echo "<a href='forum.php'>return forum page</a><br><br>";   }   ?>   </article>   <aside id="sidebar">   </aside>   <footer><a href="third page.html">my account</a>   </footer> </div> </body> </html>


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