a:15:{s:4:"code";s:5:"LMyv5";s:10:"min_length";i:5;s:10:"max_length";i:5;s:11:"backgrounds";a:8:{i:0;s:66:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/45-degree-fabric.png";i:1;s:61:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/cloth-alike.png";i:2;s:62:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/grey-sandbag.png";i:3;s:60:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/kinda-jean.png";i:4;s:64:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/polyester-lite.png";i:5;s:63:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/stitched-wool.png";i:6;s:62:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/white-carbon.png";i:7;s:60:"/drbd_disk1/home/www/lib/scaptcha/backgrounds/white-wave.png";}s:5:"fonts";a:1:{i:0;s:60:"/drbd_disk1/home/www/lib/scaptcha/fonts/times_new_yorker.ttf";}s:10:"characters";s:53:"ABCDEFGHJKLMNPRSTUVWXYZabcdefghjkmnprstuvwxyz23456789";s:13:"min_font_size";i:28;s:13:"max_font_size";i:28;s:5:"color";s:4:"#666";s:9:"angle_min";i:0;s:9:"angle_max";i:10;s:6:"shadow";b:1;s:12:"shadow_color";s:4:"#fff";s:15:"shadow_offset_x";i:-1;s:15:"shadow_offset_y";i:1;}
Example » A simple PHP CAPTCHA script

CAPTCHA Example

Usage

The following code will prepare a CAPTCHA image and keep the code in a session variable for later use: 

<?php
session_start();
include("simple-php-captcha.php");
$_SESSION['captcha'] = simple_php_captcha();
?>

After the call to simple_php_captcha() above, $_SESSION['captcha'] will be something like this: 

Array
(
    [code] => LMyv5
    [image_src] => /j3/ksh01/lib/scaptcha/simple-php-captcha.php?_CAPTCHA&t=0.53202700+1750653096
)

To display the CAPTCHA image, create an HTML <img> using $_SESSION['captcha']['image_src'] as the src attribute:

CAPTCHA code

To verify the CAPTCHA value on the next page load (or in an AJAX request), test against $_SESSION['captcha']['code']. You can use strtolower() or strtoupper() to perform a case-insensitive match.

Configuration

Configuration is easy and all values are optional. To specify one or more options, do this: 

<?php

$_SESSION['captcha'] = simple_php_captcha( array(
    'min_length' => 5,
    'max_length' => 5,
    'backgrounds' => array(image.png', ...),
    'fonts' => array('font.ttf', ...),
    'characters' => 'ABCDEFGHJKLMNPRSTUVWXYZabcdefghjkmnprstuvwxyz23456789',
    'min_font_size' => 28,
    'max_font_size' => 28,
    'color' => '#666',
    'angle_min' => 0,
    'angle_max' => 10,
    'shadow' => true,
    'shadow_color' => '#fff',
    'shadow_offset_x' => -1,
    'shadow_offset_y' => 1
));

>

Notes