php验证码类
<? /** * 验证码类 * @author firerat * @email lukai_rat@163.com * @time Feb 16 2011 15:28 * @lastmodify Feb 16 2011 15:28 */ class verifycode{ //image source private $im; //图片宽度 private $w; //图片高度 private $h; //验证字符集合 private $text; //字符数 private $length; //字体 private $font = array(); //字体大小 private $fontsize = array(); //字体颜色 private $fontcolor = array(); //字体的偏转角度 private $angel = array(); //背景色 private $backgroundcolor = array(); //背景图片 private $backgroundimage = array(); //坐标-x private $x ; //坐标-y private $y ; //验证码存放的字段 private $checkcodefield ; /** * 构造函数 * */ public function __construct(){ //图片宽度 $this->w = 500 ; //图片高度 $this->h = 600; //验证字符 $this->text = '0123456789qwertyuiopasdfghjklzxcvbnm'; //字体 $this->font = array( 'C:\\WINDOWS\\Fonts\\Ming Imperial.TTF', 'C:\\WINDOWS\\Fonts\\latha.TTF', 'C:\\WINDOWS\\Fonts\\ARIALNBI.TTF', 'C:\\WINDOWS\\Fonts\\GOTHICBI.TTF' ); //字符数 $this->length = '4'; //字体大小 $this->fontsize = array(50,60,70); //字体颜色 $this->fontcolor = array( array('red'=>0x14, 'green'=>0x37,'blue'=>0xad), array('red'=>0x6e, 'green'=>0x86,'blue'=>0xd6), array('red'=>0x2c, 'green'=>0x40 ,'blue'=>0x81), array('red'=>0x06, 'green'=>0x1f ,'blue'=>0x70), array('red'=>0x14, 'green'=>0x37 ,'blue'=>0xad), array('red'=>0x57, 'green'=>0x79 ,'blue'=>0xc0) ); //字体的偏转角度 $this->angel = array(2,4,8,-2,-4,-8); //背景色 $this->backgroundcolor = array( array('red'=>0x14, 'green'=>0x37,'blue'=>0xad), array('red'=>0x6e, 'green'=>0x86,'blue'=>0xd6), array('red'=>0x2c, 'green'=>0x40 ,'blue'=>0x81), array('red'=>0x06, 'green'=>0x1f ,'blue'=>0x70), array('red'=>0x14, 'green'=>0x37 ,'blue'=>0xad), array('red'=>0x57, 'green'=>0x79 ,'blue'=>0xc0) ); //背景图片 $this->backgroundimage = array( 'F:\\city_photo\\city_photo\\1\\1807141.jpg', 'F:\\city_photo\\city_photo\\1\\1807141.jpg', 'F:\\city_photo\\city_photo\\1\\1807141.jpg', 'F:\\city_photo\\city_photo\\1\\1807141.jpg', 'F:\\city_photo\\city_photo\\1\\1807141.jpg' ); //坐标轴X $this->x = 100 ; //坐标轴Y $this->y = 300 ; //验证码存放的字段 $this->checkcodefield = 'checkcode'; } /* 创建背景 * * @return $im */ public function createImgae(){ //$this->im = imagecreatetruecolor($this->w,$this->h); $key = array_rand($this->backgroundimage); $this->im = imagecreatefromjpeg( $this->backgroundimage[$key]); return $this->im; } /* 创建背景的索引色 * * @return */ public function createBackgroundColor(){ //获取背景随机颜色组key $rgbGroupKey = array_rand($this->backgroundcolor); $red = $this->backgroundcolor[$rgbGroupKey]['red']; $green = $this->backgroundcolor[$rgbGroupKey]['green']; $blue = $this->backgroundcolor[$rgbGroupKey]['blue']; //返回颜色索引 return imagecolorallocate($this->im, $red, $green, $blue); } /* 获取随机字符，并将字符存放发到 * * @return */ public function getRandStr(){ $randChars = ''; for($i = 0 ; $i < $this->length ; $i++){ $randChars .= $this->text[rand(0,strlen($this->text))] ; } //字体编码统一转换为utf-8 //$randChars = iconv("GB2312","UTF-8",$randChars); //写进session $_SESSION[$this->checkcodefield] = $randChars; return $randChars; } /* 创建字体颜色索引 * @return */ public function createFontColor(){ //获取背景随机颜色组key $rgbGroupKey = array_rand($this->fontcolor); $red = $this->fontcolor[$rgbGroupKey]['red']; $green = $this->fontcolor[$rgbGroupKey]['green']; $blue = $this->fontcolor[$rgbGroupKey]['blue']; //颜色索引 return imagecolorallocate($this->im, $red, $green, $blue);; } //添加文字到图片 public function addTextToImage(){ //字体颜色 $fontcolor =$this->createFontColor(); //字体 $key = array_rand($this->font); $font = $this->font[$key]; //验证码 $text = $this->getRandStr(); //偏转角度 $key = array_rand($this->angel); $_angle = $this->angel[$key]; //起始坐标 $x = $this->x; $y = $this->y; //字体大小 $key = array_rand($this->fontsize); $_fontsize = $this->fontsize[$key]; //添加文字到图片 imagettftext($this->im, $_fontsize , $_angle, $x, $y, $fontcolor, $font, $text); } /** * 输出图片 * */ public function outputImage(){ //创建布景 $this->createImgae(); //颜色添加到布景 $this->createBackgroundColor(); //添加文字到图片 $this->addTextToImage(); //增加过期,30分钟后过期 $expireTime = date("M, d Y H:i:s",time()+1800); header("Expires: {$expireTime} GMT "); header("Last-Modified: " . gmdate("D, d M Y H:i:s")." GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); //声明输出文件的类型 header('Content-type: image/png'); //输出png图片 imagepng($this->im); //释放与此图片关联的内存 imagedestroy($this->im); } } $instance = new verifycode; $instance->outputImage(); 验证码效果图：
