op zoek naar captcha formulier

<?php

session_start();

   $len        =  6; // length of string

   $lchar = 0;
   $char  = 0;

            /**************************************************
            $random_text will hold the secret and random text!
            **************************************************/
            // create 'random' text

               for($i = 0; $i < $len; $i++) {

                   while($char == $lchar) {
                   $char = rand(48, 109);
                   if($char > 57) $char += 7;
                   if($char > 90) $char += 6;
                   }

                   $random_text .= chr($char);
                   $lchar = $char;

               }
$random_text = str_replace ("0", "K", $random_text);
$random_text = str_replace ("O", "K", $random_text);

$_SESSION['code'] = $random_text;



$width      = 100; // width of image
$height     =  30; // height of image
$fontsize   =   rand(1,20); // fontsize

   //-- Random string voor images code

$fontwidth  = ImageFontWidth($fontsize) * strlen($random_text);
$fontheight = ImageFontHeight($fontsize);

// create handle for image
$im = @imagecreate($width,$height);

$een = rand(155,255);
$twee = rand(155,255);
$drie = rand(155,255);
$vier = rand(0,100);
$vijf = rand(0,100);
$zes = rand(0,100);
// white background
$background_colour = imagecolorallocate($im, $een, $twee, $drie);

// give the 'random' text a nice colour
$text_colour = imagecolorallocate($im, $vier, $vijf, $zes);

// give the border a colour too ;)
imagerectangle($im, 0, 0, $width-1, $height-1, $text_colour);

imagestring($im, $fontsize, rand(3, $width-$fontwidth-3), rand(2, $height-$fontheight-3), $random_text, $text_colour);
// lets output!
header("Content-type: image/png");
imagepng($im,'',80);

imagedestroy($im);

//sessie zetten
$_SESSION['code'] = $random_text;



?>

<?php
 
session_start();
 
   $len        =  6; // length of string
 
   $lchar = 0;
   $char  = 0;
 
            /**************************************************
            $random_text will hold the secret and random text!
            **************************************************/
            // create 'random' text
 
               for($i = 0; $i < $len; $i++) {
 
                   while($char == $lchar) {
                   $char = rand(48, 109);
                   if($char > 57) $char += 7;
                   if($char > 90) $char += 6;
                   }
 
                   $random_text .= chr($char);
                   $lchar = $char;
 
               }
$random_text = str_replace ("0", "K", $random_text);
$random_text = str_replace ("O", "K", $random_text);
 
$_SESSION['code'] = $random_text;
 
 
 
$width      = 100; // width of image
$height     =  30; // height of image
$fontsize   =   rand(1,20); // fontsize
 
   //-- Random string voor images code
 
$fontwidth  = ImageFontWidth($fontsize) * strlen($random_text);
$fontheight = ImageFontHeight($fontsize);
 
// create handle for image
$im = @imagecreate($width,$height);
 
$een = rand(155,255);
$twee = rand(155,255);
$drie = rand(155,255);
$vier = rand(0,100);
$vijf = rand(0,100);
$zes = rand(0,100);
// white background
$background_colour = imagecolorallocate($im, $een, $twee, $drie);
 
// give the 'random' text a nice colour
$text_colour = imagecolorallocate($im, $vier, $vijf, $zes);
 
// give the border a colour too ;)
imagerectangle($im, 0, 0, $width-1, $height-1, $text_colour);
 
imagestring($im, $fontsize, rand(3, $width-$fontwidth-3), rand(2, $height-$fontheight-3), $random_text, $text_colour);
// lets output!
header("Content-type: image/png");
imagepng($im,'',80);
 
imagedestroy($im);
 
//sessie zetten
$_SESSION['code'] = $random_text;
 
 
 
?>

<?php
<img src='random.php'> Typ de code over : <input name='code' type='text' value='' size='11' maxlength='10'>
?>

<?php
<img src='random.php'> Typ de code over : <input name='code' type='text' value='' size='11' maxlength='10'>
?>

<?php

if($_POST['code'] != $_SESSION['code']) {

                     echo "Je moet wel de goede activatiecode invullen! Let op hoofdletters en cijfers. <a href='javascript:history.go(-1)'>Ga terug</a>.";


} else {

//oke netjes

}

?>

<?php
 
if($_POST['code'] != $_SESSION['code']) {
 
                     echo "Je moet wel de goede activatiecode invullen! Let op hoofdletters en cijfers. <a href='javascript:history.go(-1)'>Ga terug</a>.";
 
 
} else {
 
//oke netjes
 
}
 
?>