I noticed that out of the blue my contact form located at www.bkriegtech.net/?page=contact stopped working. It's just saying that the captcha string is invalid. Below is the code from a few pages:

processor.php

<?php

$where_form_is="http://".$_SERVER['SERVER_NAME'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));

session_start();
if( ($_SESSION['security_code']==$_POST['security_code']) && (!empty($_POST['security_code'])) ) { 
mail("support@bkriegtech.net","Support Inquiry from Website","Form data:

Name: " . $_POST['field_1'] . " 
E-Mail Address: " . $_POST['field_2'] . " 
Username: " . $_POST['field_3'] . " 
Problem Type: " . $_POST['field_4'] . " 
Details: " . $_POST['field_5'] . " 


 .
");

include("confirm.html");
}
else {
echo "You have entered an invalid captcha string, please go back and try again.";
}

?>

form.php (included in the link above with a php include)

              <link rel="stylesheet" type="text/css" href="calendar/calendar-blue2.css" />
              <script type="text/javascript" src="calendar/calendar.js"></script>
              <script type="text/javascript" src="calendar/calendar-en.js"></script>
              <script type="text/javascript" src="calendar/calendar-setup.js"></script>

        <SCRIPT type=text/javascript>
        <!--
        function collapseElem(obj)
        {
            var el = document.getElementById(obj);
            el.style.display = 'none';
        }


        function expandElem(obj)
        {
            var el = document.getElementById(obj);
            el.style.display = '';
        }


        //-->
        </SCRIPT>

            <SCRIPT type=text/javascript>
            <!--

            // collapse all elements, except the first one
            function collapseAll()
            {
                var numFormPages = 1;

                for(i=2; i <= numFormPages; i++)
                {
                    currPageId = ('mainForm_' + i);
                    collapseElem(currPageId);
                }
            }


            //-->
            </SCRIPT>

        <SCRIPT type=text/javascript>
        <!--
            function validateField(fieldId, fieldBoxId, fieldType, required)
            {
                fieldBox = document.getElementById(fieldBoxId);
                fieldObj = document.getElementById(fieldId);

                if(fieldType == 'text'  ||  fieldType == 'textarea'  ||  fieldType == 'password'  ||  fieldType == 'file'  ||  fieldType == 'phone'  || fieldType == 'website')
                {    
                    if(required == 1 && fieldObj.value == '')
                    {
                        fieldObj.setAttribute("class","mainFormError");
                        fieldObj.setAttribute("className","mainFormError");
                        fieldObj.focus();
                        return false;                    
                    }

                }


                else if(fieldType == 'menu'  || fieldType == 'country'  || fieldType == 'state')
                {    
                    if(required == 1 && fieldObj.selectedIndex == 0)
                    {                
                        fieldObj.setAttribute("class","mainFormError");
                        fieldObj.setAttribute("className","mainFormError");
                        fieldObj.focus();
                        return false;                    
                    }

                }


                else if(fieldType == 'email')
                {    
                    if((required == 1 && fieldObj.value=='')  ||  (fieldObj.value!=''  && !validate_email(fieldObj.value)))
                    {                
                        fieldObj.setAttribute("class","mainFormError");
                        fieldObj.setAttribute("className","mainFormError");
                        fieldObj.focus();
                        return false;                    
                    }

                }



            }

            function validate_email(emailStr)
            {        
                apos=emailStr.indexOf("@");
                dotpos=emailStr.lastIndexOf(".");

                if (apos<1||dotpos-apos<2) 
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }


            function validateDate(fieldId, fieldBoxId, fieldType, required,  minDateStr, maxDateStr)
            {
                retValue = true;

                fieldBox = document.getElementById(fieldBoxId);
                fieldObj = document.getElementById(fieldId);    
                dateStr = fieldObj.value;


                if(required == 0  && dateStr == '')
                {
                    return true;
                }


                if(dateStr.charAt(2) != '/'  || dateStr.charAt(5) != '/' || dateStr.length != 10)
                {
                    retValue = false;
                }    

                else    // format's okay; check max, min
                {
                    currDays = parseInt(dateStr.substr(0,2),10) + parseInt(dateStr.substr(3,2),10)*30  + parseInt(dateStr.substr(6,4),10)*365;
                    //alert(currDays);

                    if(maxDateStr != '')
                    {
                        maxDays = parseInt(maxDateStr.substr(0,2),10) + parseInt(maxDateStr.substr(3,2),10)*30  + parseInt(maxDateStr.substr(6,4),10)*365;
                        //alert(maxDays);
                        if(currDays > maxDays)
                            retValue = false;
                    }

                    if(minDateStr != '')
                    {
                        minDays = parseInt(minDateStr.substr(0,2),10) + parseInt(minDateStr.substr(3,2),10)*30  + parseInt(minDateStr.substr(6,4),10)*365;
                        //alert(minDays);
                        if(currDays < minDays)
                            retValue = false;
                    }
                }

                if(retValue == false)
                {
                    fieldObj.setAttribute("class","mainFormError");
                    fieldObj.setAttribute("className","mainFormError");
                    fieldObj.focus();
                    return false;
                }
            }
        //-->
        </SCRIPT>

<body onLoad="collapseAll()">
<div id="mainForm">
<div id="formHeader">
<p class="formInfo"></p>
</div>
<br/>
<form method=post enctype=multipart/form-data action=http://www.bkriegtech.net/contactform/processor.php onSubmit="return validatePage1();">
<table id="mainForm_1" class="mainForm">
<font size="2" color="#D3D3D3">
<tr><td><font size="2" color="#D3D3D3">Name: *</td><td><input type=text name=field_1 id=field_1 size='30' value='' /></td></tr>

<tr><td><font size="2" color="#D3D3D3">Email Address: *</td><td><input type=text name=field_2 id=field_2 size='30' value=''></td></tr>

<tr><td><font size="2" color="#D3D3D3">Username:</td><td><input type=text name=field_3 id=field_3 size='30' value=''></td></tr>

<tr><td><font size="2" color="#D3D3D3">Problem Type: *</td><td><select name=field_4 id=field_4>
<option value=''></option>
<option value="Testimonial">Testimonial</option><option value="Low">Low</option>
<option value="Medium">Medium</option>
<option value="High">High</option><option value="Urgent">Urgent</option>
<option value="Critical">Critical</option></select></td></tr>

<tr><td><font size="2" color="#D3D3D3">Details*:</td><td><textarea align="right" name=field_5 id=field_5 rows=10 cols=30></textarea></td></tr>

<tr><td><font size="2" color="#D3D3D3">Please type the letters in the image.</span><BR><img src="http://www.bkriegtech.net/contactform/CaptchaSecurityImages.php" /></td><td valign="bottom"><input align="right" id="captchaForm" name="security_code"  type="text" /></td></tr>
<tr><td colspan="2"><br /><br /><center><input id="saveForm"  type="submit" value="Submit" /></center></td></tr>
</table>
</form>
        
<SCRIPT type=text/javascript>
<!--
            function validatePage1()
            {
retVal = true;
if (validateField('field_1','fieldBox_1','text',1) == false)
 retVal=false;
if (validateField('field_2','fieldBox_2','text',1) == false)
 retVal=false;
if (validateField('field_3','fieldBox_3','text',0) == false)
 retVal=false;
if (validateField('field_4','fieldBox_4','menu',1) == false)
 retVal=false;
if (validateField('field_5','fieldBox_5','textarea',1) == false)
 retVal=false;

                if(retVal == false)
                {
                    alert('Please correct the errors.  Fields marked with an asterisk (*) are required');
                    return false;
                }
                return retVal;
            }
        //-->
        </SCRIPT>
        </ul></div><div id="footer"></div>

CaptchaSecurityImages.php

<?php
session_start();
 

 
class CaptchaSecurityImages {
 
   var $font = 'monofont.ttf';
 
   function generateCode($characters) {
      /* list all possible characters, similar looking characters and vowels have been removed */
      $possible = '23456789bcdfghjkmnpqrstvwxyz';
      $code = '';
      $i = 0;
      while ($i < $characters) { 
         $code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
         $i++;
      }
      return $code;
   }
 
   function CaptchaSecurityImages($width='120',$height='40',$characters='6') {
      $code = $this->generateCode($characters);
      /* font size will be 75% of the image height */
      $font_size = $height * 0.75;
      $image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
      /* set the colours */
      $background_color = imagecolorallocate($image, 255, 255, 255);
      $text_color = imagecolorallocate($image, 20, 40, 100);
      $noise_color = imagecolorallocate($image, 100, 120, 180);
      /* generate random dots in background */
      for( $i=0; $i<($width*$height)/3; $i++ ) {
         imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
      }
      /* generate random lines in background */
      for( $i=0; $i<($width*$height)/150; $i++ ) {
         imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
      }
      /* create textbox and add text */
      $textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
      $x = ($width - $textbox[4])/2;
      $y = ($height - $textbox[5])/2;
      imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
      /* output captcha image to browser */
      imagejpeg($image);
      imagedestroy($image);
      $_SESSION['security_code'] = $code;
   }
 
}
 
$width = isset($_GET['width']) ? $_GET['width'] : '120';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) ? $_GET['characters'] : '6';
 
header('Content-Type: image/jpeg');
$captcha = new CaptchaSecurityImages($width,$height,$characters);
 
?>

My guess is that the security code being served is not corresponding with the images. Try echoing $_POST['security_code'] and $_SESSION['security_code'] and see what you get.

Do you have an example of where I need to do this at? I'm not the most expert PHP developer.

In processor.php add the following after session_start()

PHP Code:

echo $_SESSION['security_code'] . '<br />';
echo $_POST['security_code']; 


Post back with the output.

https://www.bkriegtech.net/contactform/processor.php is the actual script, still says the same thing and doesn't echo anything, even after filling out the form.

Try this:

PHP Code:

<?php
//processor.php
$where_form_is="http://".$_SERVER['SERVER_NAME'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));

session_start();
?>
Test Output: <br />
POST: <?php echo $_POST['security_code']; ?> <br />
SESSION: <?php echo $_SESSION['security_code']; ?> <br />
<?php
if( ($_SESSION['security_code']==$_POST['security_code']) && (!empty($_POST['security_code'])) ) { 
mail("support@bkriegtech.net","Support Inquiry from Website","Form data:

Name: " . $_POST['field_1'] . " 
E-Mail Address: " . $_POST['field_2'] . " 
Username: " . $_POST['field_3'] . " 
Problem Type: " . $_POST['field_4'] . " 
Details: " . $_POST['field_5'] . " 


 .
");

include("confirm.html");
}
else {
echo "You have entered an invalid captcha string, please go back and try again.";
}

?>

Test Output: 
POST:  
SESSION: 9yvy6f 
You have entered an invalid captcha string, please go back and try again.

Alright, well I get it now... not sure why it's not posting anything.

I dont know if it makes any difference, but your missing some " in your <form> tag.
Have you tried to output the $_POST array, to see if any value is submitted or if it's just the security_code that's missing?

Try adding var_dump($_POST); in the same place as Nullpointer's test code.

Output:

Test Output: 
Dump post: array(0) { } 
POST:  
SESSION: jrcycx 
You have entered an invalid captcha string, please go back and try again.

Weird...

Indeed. It's almost as if the form sends to another page, which in turn redirects to precessor.php, but the form looks correct... And the $_POST array isn't used anywhere else, so no other code is screwing with it. Odd.

It shouldn't matter, but have you tried with different browsers?

Yeah I tried FF3 and IE7, and IE8 when I upgraded to that last night. Same thing.

I have no idea what to do. Maybe someone has a decent script they can recommend for free? I just need it to do what www.bkriegtech.net/?page=contact does.

There are a lot of CAPTCHAs out there. Personally, I use reCAPTCHA (http://recaptcha.net/).

If you want to fix your current script, try validating your html to identify any problems with your form. From the code you posted it appears you are missing some quotes.

Originally Posted by NullPointer

There are a lot of CAPTCHAs out there. Personally, I use reCAPTCHA (http://recaptcha.net/).

If you want to fix your current script, try validating your html to identify any problems with your form. From the code you posted it appears you are missing some quotes.

Well HTML errors have nothing to do with this problem it's something in my PHP but where, I have no idea.

Well that just means your not passing it right use AJAX to send the XMLHttpRequest with a get/post function to carry the code to the next page then use javascript to restate the image. Of course I think this form is pass due date but owell.