joomla 图形验证码

<?php /** * description:ZMAX验证码 主文件 * author：min.zhang * Email:zhang19min88@163.com * Url:http://www.zmax99.com * copyright:南宁市程序人软件科技有限责任公司保留所有权利 * date:2014-12-08 */ /** * @description validatecode class file * * @copyright */ class CValidateCode { /** * @description random seed * @type string */ private $_charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; /** * @description captchar * @type string */ private $_code; /** * @description the length of captchar * @type int */ private $_codelen = 4; /** * @description the width(height) of captchar * @type int */ private $_width = 130; private $_height = 50; /** * @description the handle of image * @type object */ private $_img; private $_font; private $_fontsize = 20; private $_fontcolor; /** * @description the path of this file * @type string00 */ private $_path; public function __construct($path_root) { $this->_path = $path_root; $this->_font = $path_root.'/elephant.ttf'; } /** * @description create code form rand number * @param none * @return none */ private function _createCode() { $_len = strlen($this->_charset)-1; for ($i=0;$i<$this->_codelen;$i++) { $this->_code .= $this->_charset[mt_rand(0,$_len)]; } } private function _createBg() { $this->_img = imagecreatetruecolor($this->_width, $this->_height); $color = imagecolorallocate($this->_img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255)); imagefilledrectangle($this->_img,0,$this->_height,$this->_width,0,$color); } private function _createFont() { $_x = $this->_width / $this->_codelen; for ($i=0;$i<$this->_codelen;$i++) { $this->_fontcolor = imagecolorallocate($this->_img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imagettftext($this->_img,$this->_fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->_height / 1.4,$this->_fontcolor,$this->_font,$this->_code[$i]); } } private function _createLine() { for ($i=0;$i<6;$i++) { $color = imagecolorallocate($this->_img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imageline($this->_img,mt_rand(0,$this->_width),mt_rand(0,$this->_height),mt_rand(0,$this->_width),mt_rand(0,$this->_height),$color); } for ($i=0;$i<100;$i++) { $color = imagecolorallocate($this->_img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)); imagestring($this->_img,mt_rand(1,5),mt_rand(0,$this->_width),mt_rand(0,$this->_height),'*',$color); } } private function _outPut($strFileName, $strPath="") { $path = $strPath; if($path=="") { $path = $this->_path; } $filePath = $path .'/'.$strFileName; header('Content-type:image/png'); imagepng($this->_img,$filePath); //在这里已经释放了图片资源 imagedestroy($this->_img); } /** * @description get the captcha image * @param string $strFileName the name of the image * @param string $strPath the path of the image .default is the root path * @return none */ public function createImage($strFileName, $strPath="") { $this->_createBg(); $this->_createCode(); $this->_createLine(); $this->_createFont(); $this->_outPut($strFileName ,$strPath); unset($this->_font); } /** * @description get the image code * @param none * @return string the code on the image */ public function getCode() { return strtolower($this->_code); } }