Captcha

[fedefrankk]

Hola a todos, ya tengo armado un formulario con todos los campos y busque en internet y encontre un codigo captcha, lo que no se hacer es que no tenga tantos caracteres, quiero uno bajarlo a 5 caracteres pero no se como hacerlo...

dejo codigo

Código PHP:

<?php
 
// Start the session so we can store our generated key inside it for later retrieval
 
session_start( );
 
// Set to whatever size you want, or randomize for more security
 
$captchaTextSize = 7;
 
do {
 
    // Generate a random string and encrypt it with md5
 
    $md5Hash = md5( microtime( ) * mktime( ) );
 
    // Remove any hard to distinguish characters from our hash
 
    preg_replace( '([1aeilou0])', "", $md5Hash );
 
} while( strlen( $md5Hash ) < $captchaTextSize );
 
// we need only 7 characters for this captcha
 
$key = substr( $md5Hash, 0, $captchaTextSize );
 
// Add the newly generated key to the session. Note, it is encrypted.
 
$_SESSION['key'] = md5( $key );
 
// grab the base image from our pre-generated captcha image background
 
$captchaImage = imagecreatefrompng( "images/captcha.png" );
 
/* 
 
Select a color for the text. Since our background is an aqua/greenish color, we choose a text color that will stand out, but not completely. A slightly darker green in our case.
 
*/ 
 
$textColor = imagecolorallocate( $captchaImage, 31, 118, 92 );
 
/* 
 
Select a color for the random lines we want to draw on top of the image, in this case, we are going to use another shade of green/blue
 
*/
 
$lineColor = imagecolorallocate( $captchaImage, 15, 103, 103 );
 
// get the size parameters of our image
 
$imageInfo = getimagesize( "images/captcha.png" );
 
// decide how many lines you want to draw
 
$linesToDraw = 10;
 
// Add the lines randomly to the image
 
for( $i = 0; $i < $linesToDraw; $i++ )  {
 
    // generate random start spots and end spots
 
    $xStart = mt_rand( 0, $imageInfo[ 0 ] );
    $xEnd = mt_rand( 0, $imageInfo[ 0 ] );
 
    // Draw the line to the captcha
 
    imageline( $captchaImage, $xStart, 0, $xEnd, $imageInfo[1], $lineColor );
 
}
 
/* 
 
Draw our randomly generated string to our captcha using the given true type font. In this case, I am using BitStream Vera Sans Bold, but you could modify it to any other font you wanted to use.
 
*/
 
imagettftext( $captchaImage, 20, 0, 35, 35, $textColor, "fonts/VeraBd.ttf", $key );
 
// Output the image to the browser, header settings prevent caching
 
header ( "Content-type: image/png" );
 
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Fri, 19 Jan 1994 05:00:00 GMT");
header("Pragma: no-cache");
 
imagepng( $captchaImage );
 
?>
 

Saludos a todos y gracias de antemano..
saludos
fede

[oscard41]

creo que debes cambiar el valor de la variable $linesToDraw a 5

$linesToDraw = 5;


Saludos

[botxii]

Es la variable captchaTextSize, la primera que se define. Si lees el comentario(inglés) verás el funcionamiento

[fedefrankk]

Buenas, lo hice y no funciono, apague el pc, lo prendi y si funciono, ahora, si yo pongo 5, me salen 5 caracteres, si apreto actualizar me salen 10 caracteres, o mas,

Osea la primera vez salen 5 caracter y siactualizo me salen mas de 10 o 10.

Código PHP:

$captchaTextSize = 5;
 

Este archivo si todo esta bien pasa a otro,

Código PHP:

<?php
 
session_start( ); // allows us to retrieve our key form the session
 
/* 
 
First encrypt the key passed by the form, then compare it to the already encrypted key we have stored inside our session variable
 
*/
 
if( md5( $_POST[ 'code' ] ) != $_SESSION[ 'key' ] ) {
 
       echo "You ented the wrong code, please try again!";
 
} else {
 
       echo "Success, you ented the correct code, rock and roll...";
 
}
 
?>
 

en este ultimo pude ser que tenga que eliminar la session?... creo que no tiene nada que ver....

Saludos y gracias por sus respuestas.!!!

fede