Tengo lo que genera el captcha.php
CAPTCHA.PHP
Código PHP:
<?php
//Start the session so we can store what the code actually is.
session_start();
//Now lets use md5 to generate a totally random string
$md5 = md5(microtime() * mktime());
/*
We dont need a 32 character long string so we trim it down to 5
*/
$string = substr($md5,0,5);
/*
Now for the GD stuff, for ease of use lets create
the image from a background image.
*/
$captcha = imagecreatefrompng("captcha.png");
/*
Lets set the colours, the colour $line is used to generate lines.
Using a blue misty colours. The colour codes are in RGB
*/
$black = imagecolorallocate($captcha, 0, 0, 0);
$line = imagecolorallocate($captcha,233,239,239);
/*
Now to make it a little bit harder for any bots to break,
assuming they can break it so far. Lets add some lines
in (static lines) to attempt to make the bots life a little harder
*/
imageline($captcha,0,0,39,29,$line);
imageline($captcha,40,0,64,29,$line);
/*
Now for the all important writing of the randomly generated string to the image.
*/
imagestring($captcha, 5, 20, 10, $string, $black);
/*
Encrypt and store the key inside of a session
*/
$_SESSION['key'] = md5($string);
/*
Output the image
*/
header("Content-type: image/png");
imagepng($captcha);
?> En teoria esto se guarda en una variable de sesion llamada $_SESSION['key'] no??
Luego tengo mi formulario. (No hace falta que tenga ningun "session start() verdad?)
FORMULARIO
Código HTML:
<form id="formulario" method="post" action="includes/validar.php"> <label for="captcha">Codigo de seguridad: *</label> <img id="cap" name="cap" src="captcha.php"> <label for="captcha">Repite el Código de seguridad:</label> <input type="text" name="captcha_code" style="width: 150px;"> <label for="send"></label> <input id="send" name="send" value="Registrarme!" type="submit" /> </form>
VALIDAR.PHP
Código PHP:
<?php
session_start();
if ($_SESSION['key'] != $_POST['captcha_code']) {
echo "CODIGO ERRONEO";
}
else{
echo "CODIGO CORRECTO";
}
?> 
Es normal que en la variable de $_SESSION['key'] se guarde un numero la tira de largoooooooo, no debería aparecer ahi el valor del captcha?
Ayuda pliss
