个人写的PHP验证码生成类分享

 width = $num*20; $this->height = $height; $this->num = $num; $this->imgType = $imgType; $this->Type = $Type; $this->codestr = $this->codestr(); $this->zuhe(); } // 2. 定义随机获取字符串函数 private function codestr(){ switch($this->Type){ case 1:   // 类型为1 获取1-9随机数 $str = implode("",array_rand(range(0,9),$this->num)); break; case 2:   // 类型为2 获取a-z随机小写字母 $str = implode("",array_rand(array_flip(range(a,z)),$this->num)); break; case 3:   // 类型为3 获取数字,小写字母,大写字母 混合 for($i=0;$inum;$i++){ $m = rand(0,2); switch($m){ case 0: $o = rand(48,57); break; case 1: $o = rand(65,90); break; case 2: $o = rand(97,122); break; } $str .= sprintf("%c",$o); } break; } return $str; } // 3. 初始化画布图像资源 private function Hb(){ $this->hb = imagecreatetruecolor($this->width,$this->height); } // 4. 生成背景颜色 private function Bg(){ return imagecolorallocate($this->hb,rand(130,250),rand(130,250),rand(130,250)); } // 5. 生成字体颜色 privat<strong style="color:transparent">来源gaodai#ma#com搞@代~码网</strong>e function Font(){ return imagecolorallocate($this->hb,rand(0,100),rand(0,100),rand(0,100)); } // 6. 填充背景颜色 private function BgColor(){ imagefilledrectangle($this->hb,0,0,$this->width,$this->height,$this->Bg()); } // 7. 干扰点 private function ganrao(){ $sum=floor(($this->width)*($this->height)/3); for($i=0;$ihb,rand(0,$this->width),rand(0,$this->height),$this->Bg()); } } // 8. 随机直线 弧线 private function huxian(){ for($i=0;$inum;$i++){ imageArc($this->hb,rand(0,$this->width),rand(0,$this->height),rand(0,$this->width),rand(0,$this->height),rand(0,360),rand(0,360),$this->Bg()); } } // 9. 写字 private function xiezi(){ for($i=0;$inum;$i++){ $x=ceil($this->width/$this->num)*$i; $y=rand(1,$this->height-15); imagechar($this->hb,5,$x+4,$y,$this->codestr[$i],$this->Font()); } } // 10. 输出 private function OutImg(){ $shuchu="image".$this->imgType; $header="Content-type:image/".$this->imgType; if(function_exists($shuchu)){ header($header); $shuchu($this->hb); }else{ exit("GD库没有此类图像"); } } // 11. 拼装 private function zuhe(){ $this->Hb(); $this->BgColor(); $this->ganrao(); $this->huxian(); $this->xiezi(); $this->OutImg(); } public function getCodeStr(){ return $this->codestr; } } ?>