<?php
session_start();
date_default_timezone_set('UTC');
$width = !empty($_GET['width']) && $_GET['width'] <= 1000 && $_GET['width'] > 0 ? $_GET['width'] : 300;
$height = !empty($_GET['height']) && $_GET['height'] <= 1000 && $_GET['height'] > 0 ? $_GET['height'] : 80;
$captcha = new SimpleCaptcha($width, $height);
$captcha->output();
class SimpleCaptcha
{
private $image;
private $width;
private $height;
private $chars_count = 5;
private $chars_set = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ12345689';
private $colors = array('880000', '008800', '000088', '888800', '880088', '008888', '000000');
private $lines_count = 8;
private $bg_color = 'ffffff';
private $session_key = 'simple_captcha';
public function __construct($width, $height)
{
$this->width = intval($width);
$this->height = intval($height);
}
public function output()
{
$this->initImage();
$this->drawPoints();
$this->drawLines();
$text = $this->drawText();
$this->setSession($text);
