PHP Captcha - Session always empty
captcha, php, session
Solution
<?php
session_start();
require('classes/PhpCaptcha.php');
$aFonts = array('fonts/VeraBd.ttf', 'fonts/VeraIt.ttf', 'fonts/Vera.ttf');
$oVisualCaptcha = new PhpCaptcha($aFonts, 200, 60);
$oVisualCaptcha->SetBackgroundImages('captchaimgbg.jpg');
$oVisualCaptcha->Create();
?>
You need to start the session with `session_start()` at the TOP of the code on all the pages that access/set `$_SESSION` variables.
Problem
Im trying to add a captcha to my registration form. The image is rendering just fine except the session variable is always empty, so it doesn't work at all.. I am using the following class : http://www.ejeliot.com/pages/php-captcha According to the documentation i had to make a php file with the following content: ``` <?php require('classes/PhpCaptcha.php'); $aFonts = array('fonts/VeraBd.ttf', 'fonts/VeraIt.ttf', 'fonts/Vera.ttf'); $oVisualCaptcha = new PhpCaptcha($aFonts, 200, 60); $oVisualCaptcha->SetBackgroundImages('captchaimgbg.jpg'); $oVisualCaptcha->Create(); ?> ``` And include this as an image. Now ive looked into the Create(); function, and in this function another function named GenerateCode(); is called, which is responsible for generating the letters and putting it into a session variable. The code is as follow: ``` function GenerateCode() { // reset code $this->sCode = ''; // loop through and generate the code letter by letter for ($i = 0; $i < $this->iNumChars; $i++) { if (count($this->aCharSet) > 0) { // select random character and add to code string $this->sCode .= $this->aCharSet[array_rand($this->aCharSet)]; } else { // select random character and add to code string $this->sCode .= chr(rand(65, 90)); } } // save code in session variable if ($this->bCaseInsensitive) { $_SESSION[CAPTCHA_SESSION_ID] = strtoupper($this->sCode); } else { $_SESSION[CAPTCHA_SESSION_ID] = $this->sCode; } } ``` The CAPTCHA_SESSION_ID is defined at the top of the class file. In my index i have session_start(); , i double checked this and that is not the problem. No matter what i try, $_SESSION is always empty, even if i add $_SESSION['bla'] = 'bla' manually in the create(); function, it doesn't show up. Does anyone have an idea what is causing this, or what i am doing wrong? Thanks!