php图片验证码种
程序员文章站
2024-01-13 17:25:52
...
php图片验证码类
buildAndExportImage(); * * 作 者: luojing * 创建时间: 2013-3-27 上午11:42:12 */class Captcha { private $width;//宽度 private $height; //高度 private $codeNum;//验证码字符数量 private $image;//验证码图像资源 private $sessionKey;//session中保存的名字 private $captcha;//验证码字符串 const charWidth = 10;//单个字符宽度,根据输出字符大小而变 /** * 创建验证码类，初始化相关参数 * @param $width 图片宽度 * @param $height 图片高度 * @param $codeNum 验证码字符数量 * @param $sessionKey session中保存的名字 */ function __construct($width = 50, $height = 20, $codeNum = 4, $sessionKey = 'captcha') { $this->width = $width; $this->height = $height; $this->codeNum = $codeNum; $this->sessionKey = $sessionKey; //保证最小高度和宽度 if($height height = 20; } if($width width = $codeNum * self::charWidth + 10; } } /** * 构造并输出验证码图片 */ public function buildAndExportImage() { $this->createImage(); $this->setDisturb(); $this->setCaptcha(); $this->exportImage(); } /** * 构造图像，设置底色 */ private function createImage() { //创建图像 $this->image = imagecreatetruecolor($this->width, $this->height); //创建背景色 $bg = imagecolorallocate($this->image, mt_rand(220, 255), mt_rand(220, 255), mt_rand(220, 255)); //填充背景色 imagefilledrectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $bg); } /** * 设置干扰元素 */ private function setDisturb() { //设置干扰点 for($i = 0; $i image, mt_rand(150, 200), mt_rand(150, 200), mt_rand(150, 200)); imagesetpixel($this->image, mt_rand(5, $this->width - 10), mt_rand(5, $this->height - 3), $color); } //设置干扰线 for($i = 0; $i image, mt_rand(150, 220), mt_rand(150, 220), mt_rand(150, 220)); imagearc($this->image, mt_rand(-10, $this->width), mt_rand(-10, $this->height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $color); } //创建边框色 $border = imagecolorallocate($this->image, mt_rand(0, 50), mt_rand(0, 50), mt_rand(0, 50)); //画边框 imagerectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $border); } /** * 产生并绘制验证码 */ private function setCaptcha() { $str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ'; //生成验证码字符 for($i = 0; $i codeNum; $i++) { $this->captcha .= $str{mt_rand(0, strlen($str) - 1)}; } //绘制验证码 for($i = 0; $i captcha); $i++) { $color = imagecolorallocate($this->image, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 200)); $x = floor(($this->width - 10)/$this->codeNum); $x = $x*$i + floor(($x-self::charWidth)/2) + 5; $y = mt_rand(2, $this->height - 20); imagechar($this->image, 5, $x, $y, $this->captcha{$i}, $color); } } /* * 输出图像,验证码保存到session中 */ private function exportImage() { if(imagetypes() & IMG_GIF){ header('Content-type:image/gif'); imagegif($this->image); } else if(imagetypes() & IMG_PNG){ header('Content-type:image/png'); imagepng($this->iamge); } else if(imagetypes() & IMG_JPEG) { header('Content-type:image/jpeg'); imagepng($this->iamge); } else { imagedestroy($this->image); die("Don't support image type!"); } //将验证码信息保存到session中，md5加密 if(!isset($_SESSION)){ session_start(); } $_SESSION[$this->sessionKey] = md5($this->captcha); imagedestroy($this->image); } function __destruct() { unset($this->width, $this->height, $this->codeNum,$this->captcha); }}
声明：本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn核实处理。
相关文章
相关视频
上一篇： PHP处理大量表单字段的便捷方法