php - emailing form data filled from db -

i have form name , details filled , iam able collect details filled , email data.but in form 1 field filled db "comments" field.

        <?php     $sql = "select * comments id = no ";     $result = mysqli_query ($conn,$sql) or die (mysqli_error ());     $count = 1;     while ($row = mysqli_fetch_array ($result))     {?>    <tr>    <td valign="top" >    <label for="old_comments">comments <?php       echo $count     ?>:</label>     </td>    <td style="    padding-bottom: 0px;">    <input type="text" name="old_comments" value="<?php echo $row ['updates']; ?> "     readonly maxlength="500" size="30" style=" width: 710px; "> <br> <span class="helptext" >previous comments.</span> </td>     </tr>      <?php      $count = $count + 1;     }     ?> 

there number of comments here 1 recent comment getting inserted mail.i need comments in db particular post id table inserted mail body.php code iam using send email:

     <?php  if(isset($_post['email'])) {  $email_to = mail@domain.com;  $email_subject = omments;  function died($error) {  echo "we sorry, there error(s) found form submitted. ";        die();  }  // validation expected data exists  if(!isset($_post['old_comments'])) {  }  $old_comments = $_post['old_comments]; // required  $error_message = "";  $email_exp = '/^[a-za-z0-9._%-]+@[a-za-z0-9.-]+\.[a-za-z]{2,4}$/';  $string_exp = "/^[a-za-z .'-]+$/";  if(strlen($error_message) > 0) {  died($error_message);  }  $email_message = "comments";  function clean_string($string)  {  $bad = array("content-type","bcc:","to:","cc:","href");  return str_replace($bad,"",$string);  }  $email_message .= "previous comments: ".clean_string($comments)."\n\n";  // create email headers  $headers = 'from: '.$email_from."\r\n".   'x-mailer: php/' . phpversion();   @mail($email_to, $email_subject, $email_message, $headers);     ?>   <?php   }   ?> 

can 1 out.thanks in advance