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shol

undefined variable errorString

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undefined variable errorString. what's wrong with this?
 
Notice: Undefined variable: errorString in /Applications/XAMPP/xamppfiles/htdocs/finalproject/donate/thankyou.php on line 97

Notice: Undefined variable: messageString in /Applications/XAMPP/xamppfiles/htdocs/finalproject/donate/thankyou.php on line101
 
<?php


require "config.php";
require "connect.php";


if(isset($_POST['submitform']) && isset($_POST['txn_id']))
{
$_POST['nameField'] = esc($_POST['nameField']);
$_POST['websiteField'] =  esc($_POST['websiteField']);
$_POST['messageField'] = esc($_POST['messageField']);


$error = array();


if(mb_strlen($_POST['nameField'],"utf-8")<2)
{
$error[] = 'Please fill in a valid name.';
}


if(mb_strlen($_POST['messageField'],"utf-8")<2)
{
$error[] = 'Please fill in a longer message.';
}


if(!validateURL($_POST['websiteField']))
{
$error[] = 'The URL you entered is invalid.';
}


$errorString = '';
if(count($error))
{
$errorString = join('<br />',$error);
}
else
{
mysql_query(" INSERT INTO dc_comments (transaction_id, name, url, message)
VALUES (
'".esc($_POST['txn_id'])."',
'".$_POST['nameField']."',
'".$_POST['websiteField']."',
'".$_POST['messageField']."'
)");


if(mysql_affected_rows($link)==1)
{
$messageString = '<a href="donate.php">You were added to our donor list! »</a>';
}
}
}


?>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Thank you!</title>


<link rel="stylesheet" type="text/css" href="styles.css" />


</head>


<body class="thankyouPage">


<div id="main">
    <h1>Thank you!</h1>
    <h2>Add Yourself to our Donor Section</h2>


<div class="lightSection">
     <form action="" method="post">
         <div class="field">
                <label for="nameField">Name</label>
                <input type="text" id="nameField" name="nameField" />
</div>
            
            <div class="field">
                <label for="websiteField">Web Site</label>
                <input type="text" id="websiteField" name="websiteField" />
</div>
            
<div class="field">
                <label for="messageField">Message</label>
                <textarea name="messageField" id="messageField"></textarea>
            </div>
            
            <div class="button">
             <input type="submit" value="Submit" />
                <input type="hidden" name="submitform" value="1" />
                <input type="hidden" name="txn_id" value="<?php echo $_POST['txn_id']?>" />
            </div>
        </form>
        
        <?php
if($errorString)
{
echo '<p class="error">'.$errorString.'</p>';
}
else if($messageString)
{
echo '<p class="success">'.$messageString.'</p>';
}
?>
        
    </div>




</body>
</html>




<?php


function esc($str)
{
global $link;


if(ini_get('magic_quotes_gpc'))
$str = stripslashes($str);


return mysql_real_escape_string(htmlspecialchars(strip_tags($str)),$link);
}


function validateURL($str)
{
return preg_match('/(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:\/~\+#]*[\w\-\@?^=%&\/~\+#])?/i',$str);
}
?>
Edited by shol

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Try,

if(isset($errorString))
{
echo '<p class="error">'.$errorString.'</p>';
}
else if(isset($messageString))
{
echo '<p class="success">'.$messageString.'</p>';
}

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