formatField($joke)

$joke değişkeninde sanırım textaredan çekilen veri.
Aşağıdaki şekilde olur herhalde.

<?php
include_once("config.inc.php");
include_once("db_connect.php");
// get vars
$submitme  = $_REQUEST['submitme'];
$ptitle    = "Submit A Joke";
$meta_keys = "submit, joke, search, jokes, funny, laugher, joke, gag, laughing";
$meta_desc = "Submit A Joke";
$selected  = "SUBMIT";
include("header.php");
$showform = TRUE;
if($submitme) {
 
 // get vars
 $youremail = $_REQUEST['youremail'];
 $category  = $_REQUEST['category'];
 $joke      = $_REQUEST['joke'];
 $errorstring = "";
 $youremail = strtolower(formatField($youremail));
 if(strlen($youremail) == 0) $errorstring .="You must specify your email.<br>";
 if(strlen($category) == 0) $errorstring .="You must choose a category.<br>";
 if(strlen($joke) == 0) $errorstring .="You have not entered a joke.<br>";
 if(strlen($youremail) < 9 || strlen($youremail) > 64) $errorstring .= "Gecerli bir email adresi yazmalısınız.<br>";
 else
 {
  $emailtail = strstr($youremail, '@');
  if(!strstr($youremail, '@') || !strstr($emailtail, '.')) $errorstring .= "Gecerli bir email adresi yazmalısınız.<br>";
 }
 if(strlen($errorstring) == 0){
  // add to pending
  $ip = GetHostByName($REMOTE_ADDR); 
  $insert = mysql_query("INSERT INTO pendingjokes (category, joke, email, ip, dateadded) VALUES ('".formatField($category)."', '".strtolower(formatField($joke))."', '".formatField($youremail)."', '".$ip."', NOW())");
  if($insert) $showform = FALSE;
 }
}

?>
 <table width="100%" cellspacing="5" cellpadding="0">
   <tr>
     <td valign="top">
    <b>güzel sözler paylaşf</b><br><br>
    
    <?php
    if($showform == TRUE) {
    ?>
      Use the following form to submit a new joke to <?php echo $site_name; ?>. Please use the search feature first to make sure the joke does not exist alreay.<br><br>
     <table width="100%" cellpadding="0" cellspacing="0" border="0" align="center">
     <tr><form method="post" action="submit-joke.php"><input type="hidden" name="submitme" value="yes"><td style="padding:0px;" align="center"><br>
    <?php if(strlen($errorstring) > 0) echo "<table cellpadding=\"8\" cellspacing=\"0\" border=\"0\" align=\"center\" bgcolor=\"#cccccc\"><tr><td><font class=\"error\"><b>Eksik yerleri tamamlayın:</b><br><br>$errorstring</td></tr></table><br><br>";?>
    <table cellpadding="5" cellspacing="0" border="0" align="left">
    <tr><td><b>mail adresiniz:</b></td><td><input type="text" name="youremail" class="form" style="width:250px;" value="<?php echo stripslashes($youremail); ?>"></td></tr>
      <tr><td><b>Kategori Secin:</b></td><td><select name="category" class="form" style="width:250px;">
      <?php
        echo "<option value=''>< choose ></option>";
        $cats = mysql_query("SELECT * FROM categories ORDER BY category");
     while($row = mysql_fetch_array($cats)) {
       echo "<option value='".$row[category]."'";
       if($row[category] == $category) echo " SELECTED";
       echo ">".$row[category]."</option>";
     }
      ?>
      </select></td></tr>
      <tr><td valign="top"><b>SÖZ:</b></td><td><textarea name="joke" class="form" style="width:250px;" rows="10"><?php echo stripslashes($joke); ?></textarea></td></tr>
      <tr><td></td><td><input type="submit" value="gönder" class="form">&nbsp;&nbsp;<input type="reset" value="yenile" class="form"></td></tr>
    </table><br>
     </td></form></tr>
   </table>
    <?php
    }
    else echo "Thank You!<br><br>Your joke has been sent for approval and should appear on the site in 24 hours. Thanks again for your contribution to ".$site_name.".<br><br><br><a href='submit-joke.php'>submit another joke</a><br><a href='index.php'>home</a>";
    ?>
    
  </td>
   </tr>
 </table>
 
<?php
include("footer.php");
?>