Gracias Vallu, lo he intentado pero parece que saltan un par de errores, pongo todo el codigo porque ya no se de donde saltan los errores. jejeje
captcha.class.php
Código PHP:
<?php
/*
File: captcha.class.php
Author: Jamie McConnell
Email: jamie[at]blue44.com
URL: http://nodstrum.com/2007/09/23/captcha/
Date: 22/09/2007
License: GPL
If you do use this script, please reference me: http://nodstrum.com
Usage Instructions:
1. On your form page add the following lines:
require_once('captcha.class.php');
$captcha = new Captcha;
$captchaImage = $captcha->create();
2. In your form, where you want the Captcha displayed add this:
<?= $captchaImage; ?>
3. On the processing page add this:
require_once('captcha.class.php');
$captcha = new Captcha;
$verified = $captcha->verify($_POST[$captcha->captchaInputName]);
4. In your processing check for $verified being true/false.
if($verified) {
// Captcha was correct
} else {
// Captcha was incorrect
}
5. Thats it! :)
Enjoy.
*/
class Captcha {
/* Variables */
var $imageDirectory = 'imgs'; // No forward slash - must be writable, chmod 777
var $imageURL = 'http://miweb/imgs'; // No forward slash.
var $captchaLabel = 'Please complete the Captcha:'; // This is what is shown just above the captcha image.
var $captchaBoxStyle = 'border: 1px solid #ccc; padding: 3px; margin: 3px; width: 210px; font-family: verdana; font-size: 11px;'; // This is the style for the captcah box.
/* Advanced Users Variables */
var $captchaLength = 5;
var $imageWidth = 130;
var $imageHeight = 30;
var $imageTextColor = array(0,0,0); // RGB (Black)
var $imageLineColor = array(255,20,147); // RGB (Black)
var $imageBGColor = array(176,226,255); // RBG (Light Blue)
var $captchaInputName = 'captcha_input';
var $cookieName = 'NodstrumCaptcha';
var $cookieTimeout = 300; // 5 mins.
var $cleanupImages = true;
// Check the directories exist and are writeable.
function create() {
// Cleanup before doing anything.
$this->cleanup();
// Define the dataset and set the key.
$dataset = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','p','q','r','s','t','u','v','w','x','y','z',1,2,3,4,5,6,7,8,9);
shuffle($dataset);
$key = ''; // Initialise key.
for($i=0; $i<$this->captchaLength; $i++) {
$key .= $this->strtoupper_modified(trim($dataset[rand(0, count($dataset))]));
}
// Prep and generate the key hash - sha1.
$key = trim($key);
$keyHash = sha1($key);
// Generate the image.
$imageName = $this->generateImage($key);
if(!$imageName) {
die('There was an error generating the Captcha - Check your directory path and permissions.');
} else {
// Set the cookie.
$cookie = setcookie($this->cookieName, $keyHash, (time()+$this->cookieTimeout), '/');
if(!$cookie) {
die('Unable to set the cookie - Cookies must be enabled to use this form.');
} else {
// Return the captcha and input box.
$captchaBox = '<div style="'.$this->captchaBoxStyle.'">
'.$this->captchaLabel.'<br>
<img src="'.$this->imageURL.'/'.$imageName.'" width="'.$this->imageWidth.'" height="'.$this->imageHeight.'" style="border: 1px solid #000; margin: 2px;" alt="CAPTCHA Image"><br>
<input type="text" size="22" name="'.$this->captchaInputName.'" value="">
</div>';
return $captchaBox;
}
}
} // Create :: Function.
function generateImage($key) {
// Create the image.
$imageName = 'CAPTCHA_'.(time()+$this->cookieTimeout).'_'.rand(1,101).'_'.rand(201,9007).'.png';
$imageFilename = ''.$this->imageDirectory.'/'.$imageName.'';
$image = imagecreate($this->imageWidth, $this->imageHeight);
$background = imagecolorallocate($image, $this->imageBGColor[0], $this->imageBGColor[1], $this->imageBGColor[2]);
// Set the text colour.
$textColor = imagecolorallocate($image, $this->imageTextColor[0], $this->imageTextColor[1], $this->imageTextColor[2]);
$lineColor = imagecolorallocate($image, $this->imageLineColor[0], $this->imageLineColor[1], $this->imageLineColor[2]);
// Add some lines to screw over the form hackers.
imageline($image, 0,0,120,20, $lineColor);
imageline($image, 1,0,121,21, $lineColor);
imageline($image, 40,0,80,50, $lineColor);
imageline($image, 41,0,81,51, $lineColor);
imageline($image, 90,0,80,50, $lineColor);
// Put spaces in between the letters.
$keySplit = $this->str_split_php4($key);
$formattedKey = ''; // Initialise it.
for($i=0; $i<$this->captchaLength; $i++) {
$formattedKey .= ''.$keySplit[$i].' ';
}
// Add the text to the image.
imagestring($image, 5, 20, 10, $formattedKey, $textColor);
// Save the image.
$saveImage = imagepng($image, $imageFilename, 9);
imagedestroy($image);
if($saveImage) {
return $imageName;
} else {
return false;
}
} // GenerateImage :: Function.
function verify($userInput) {
if(isset($_COOKIE[$this->cookieName])) {
// Get the cookie and hash the user input.
$cookieDataHash = trim($_COOKIE[$this->cookieName]);
$userInputF = $this->strtoupper_modified(trim($userInput));
$userInputHash = sha1($userInputF);
// Cleanup - the form has been submitted.
$this->cleanup();
// Verfiy that the cookie data length is 40 characters long - SHA1 standard - it might have been tampered with.
if(strlen($cookieDataHash) == 40) {
if($cookieDataHash == $userInputHash) {
return true;
} else {
return false;
} // Cookie and user inputs match.
} else {
// The cookie data has been tampered with, dont verify.
return false;
} // CookieDataLength.
} else {
// No cookie was found, probably deleted, dont verify.
return false;
} // Cookie exists.
} // Verify :: Function.
function cleanup() {
setcookie($this->cookieName, '', (time()-900000000), '/');
if($openedDir = opendir($this->imageDirectory)) {
while(($file = readdir($openedDir)) !== false) {
if($file != "." && $file != "..") {
$filenameE = explode('_', $file);
$fileExpires = $filenameE[1];
if($fileExpires <= time()) {
unlink($this->imageDirectory.'/'.$file);
} else {
// Not expiring yet.
}
} else {
// Skip it.
}
} // while - reading directory.
} // Directory opened.
} // Cleanup :: Function.
function str_split_php4($text, $split = 1) {
if (!is_string($text)) return false;
if (!is_numeric($split) && $split < 1) return false;
$len = strlen($text);
$array = array();
$s = 0;
$e=$split;
while ($s <$len) {
$e=($e <$len)?$e:$len;
$array[] = substr($text, $s,$e);
$s = $s+$e;
}
return $array;
} // str_split_php4 :: Function - php.net (kjensen - http://uk3.php.net/str_split)
function strtoupper_modified($string) {
$splitString = $this->str_split_php4($string);
$fString = ''; // Initialise it.
foreach($splitString as $value) {
if(is_numeric($value)) {
$fString .= $value;
} else {
$fString .= strtoupper($value);
}
}
return $fString;
} // strtoupper_modified :: Function
} // Captcha :: Class.
?>
fun.captcha.php
Código PHP:
<?php
function autocaptcha(){
require_once('captcha.class.php');
$captcha = new Captcha;
$captchaImage = $captcha->create();
//verificamos si variables POST estan declaradas
if(isset($_POST[$captcha->captchaInputName])){
//verificamos el captcha
$verified = $captcha->verify($_POST[$captcha->captchaInputName]);
if($verified){
$message='Correcto';
}else{
$message='Incorrecto';
}
}
echo '<html>';
echo '<head>';
echo '<title>Captcha</title>';
echo '</head>';
echo '<body>';
echo 'if(isset($message)){';
echo 'echo $message;';
echo '}else{';
echo '<form name="formulario" method="post" action="fun.captcha.php">';
echo 'echo $captchaImage;';
echo '<input type="submit" value="Verificar" />';
echo ' }';
echo '</form>';
echo '</body></html>';
}
?>
muestra.php
Código PHP:
<html>
<head>
<title>Formulario Web</title>
</head>
<body>
<?php
require_once('fun.captcha.php');
echo autocaptcha();
?>
</body>
</html>
Esos son los 3 archivos que componen el codigo. Con el archivo muestra quiero que se muestre el captcha, pero la funcion me devuelve lo siguiente.
Código HTML:
Warning: Cannot modify header information - headers already sent by (output started at Miweb\muestra.php:8) in MiWeb\captcha.class.php on line 160
Warning: Cannot modify header information - headers already sent by (output started at MiWeb\muestra.php:8) in MiWeb\captcha.class.php on line 79
Unable to set the cookie - Cookies must be enabled to use this form.
Aclarar que el codigo de la funcion captcha lo ejecuto sin ponerlo en la funcion y funciona correctamente.
22/04/2010, 01:53
