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82 lines
2.4 KiB
82 lines
2.4 KiB
<?php
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/**
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* @copyright NetMonsters <team@netmonsters.ru>
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* @link http://netmonsters.ru
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* @package Majestic
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* @subpackage captcha
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* @since 2010-04-24
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*/
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class Captcha
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{
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protected $font_size = 38;
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protected $width = 200;
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protected $height = 70;
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public function getImage($token)
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{
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$font = dirname(__FILE__) . '/poh.ttf';
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$image = imagecreatetruecolor($this->width, $this->height);
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// белый фон
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$background = imagecolorallocate($image, 255, 255, 255);
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imagefilledrectangle($image, 0, 0, $this->width, $this->height, $background);
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// основная магия тут
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if (Session::get('_ctoken') == $token && Session::get('_ccode')) {
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$code = Session::get('_ccode');
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$color = imagecolorallocate($image, 81, 81, 81);
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for ($j = 0; $j < 5; $j++) {
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imageellipse($image, rand(-$this->width, $this->width * 2),
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rand(-$this->height, $this->height * 2),
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$this->width, $this->width, $color);
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}
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$letters = preg_split("//u", strtoupper($code));
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$length = count($letters);
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$step = floor($this->width / $length);
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$i = 2;
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foreach ($letters as $key => $letter) {
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imagettftext($image, $this->font_size, 0,
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rand($i + 2, $i + 4), ($this->font_size + $this->height) / 2,
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$color, $font, $letter);
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$i = $i + $step;
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}
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}
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ob_start();
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header("Cache-Control: no-store, no-cache, must-revalidate");
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header("Content-Type: image/jpg");
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imagejpeg($image, '', 100);
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imagedestroy($image);
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return ob_get_clean();
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}
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public function getToken()
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{
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$token = md5(microtime() . uniqid());
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$code = strtoupper(substr(str_ireplace(array('0', 'O'), '', md5(time() . 'captcha' . rand(0, 1000))), 1, 5));
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Session::set('_ctoken', $token);
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Session::set('_ccode', $code);
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return $token;
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}
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public function checkCode($token, $code)
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{
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if (Session::get('_ctoken') == $token && Session::get('_ccode') == strtoupper($code)) {
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// Housekeeping
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Session::del('_ccode');
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Session::del('_ctoken');
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return true;
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}
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return false;
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}
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}
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