<?php /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * CodeIgniter CAPTCHA Helper * * @package CodeIgniter * @subpackage Helpers * @category Helpers * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/helpers/captcha_helper.html */ // ------------------------------------------------------------------------ if ( ! function_exists('create_captcha')) { /** * Create CAPTCHA * * @param array array of data for the CAPTCHA * @param string path to create the image in * @param string URL to the CAPTCHA image folder * @param string server path to font * @return string */ function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') { $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200); foreach ($defaults as $key => $val) { if ( ! is_array($data) && empty($$key)) { $$key = $val; } else { $$key = isset($data[$key]) ? $data[$key] : $val; } } if ($img_path === '' OR $img_url === '' OR ! @is_dir($img_path) OR ! is_writeable($img_path) OR ! extension_loaded('gd')) { return FALSE; } // ----------------------------------- // Remove old images // ----------------------------------- $now = microtime(TRUE); $current_dir = @opendir($img_path); while ($filename = @readdir($current_dir)) { if (substr($filename, -4) === '.jpg' && (str_replace('.jpg', '', $filename) + $expiration) < $now) { @unlink($img_path.$filename); } } @closedir($current_dir); // ----------------------------------- // Do we have a "word" yet? // ----------------------------------- if ($word === '') { $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $word = ''; for ($i = 0, $mt_rand_max = strlen($pool) - 1; $i < 8; $i++) { $word .= $pool[mt_rand(0, $mt_rand_max)]; } } // ----------------------------------- // Determine angle and position // ----------------------------------- $length = strlen($word); $angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0; $x_axis = rand(6, (360/$length)-16); $y_axis = ($angle >= 0) ? rand($img_height, $img_width) : rand(6, $img_height); // Create image // PHP.net recommends imagecreatetruecolor(), but it isn't always available $im = function_exists('imagecreatetruecolor') ? imagecreatetruecolor($img_width, $img_height) : imagecreate($img_width, $img_height); // ----------------------------------- // Assign colors // ----------------------------------- $bg_color = imagecolorallocate($im, 255, 255, 255); $border_color = imagecolorallocate($im, 153, 102, 102); $text_color = imagecolorallocate($im, 204, 153, 153); $grid_color = imagecolorallocate($im, 255, 182, 182); $shadow_color = imagecolorallocate($im, 255, 240, 240); // Create the rectangle ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color); // ----------------------------------- // Create the spiral pattern // ----------------------------------- $theta = 1; $thetac = 7; $radius = 16; $circles = 20; $points = 32; for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++) { $theta += $thetac; $rad = $radius * ($i / $points); $x = ($rad * cos($theta)) + $x_axis; $y = ($rad * sin($theta)) + $y_axis; $theta += $thetac; $rad1 = $radius * (($i + 1) / $points); $x1 = ($rad1 * cos($theta)) + $x_axis; $y1 = ($rad1 * sin($theta)) + $y_axis; imageline($im, $x, $y, $x1, $y1, $grid_color); $theta -= $thetac; } // ----------------------------------- // Write the text // ----------------------------------- $use_font = ($font_path !== '' && file_exists($font_path) && function_exists('imagettftext')); if ($use_font === FALSE) { $font_size = 5; $x = rand(0, $img_width / ($length / 3)); $y = 0; } else { $font_size = 16; $x = rand(0, $img_width / ($length / 1.5)); $y = $font_size + 2; } for ($i = 0; $i < $length; $i++) { if ($use_font === FALSE) { $y = rand(0 , $img_height / 2); imagestring($im, $font_size, $x, $y, $word[$i], $text_color); $x += ($font_size * 2); } else { $y = rand($img_height / 2, $img_height - 3); imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, $word[$i]); $x += $font_size; } } // Create the border imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $border_color); // ----------------------------------- // Generate the image // ----------------------------------- $img_name = $now.'.jpg'; ImageJPEG($im, $img_path.$img_name); $img = '<img src="'.$img_url.$img_name.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />'; ImageDestroy($im); return array('word' => $word, 'time' => $now, 'image' => $img); } } /* End of file captcha_helper.php */ /* Location: ./system/helpers/captcha_helper.php */