class Code{ // 1. 定義各個成員 有寬、高、畫布、字數、類型、畫類型 private $width; //寬度
private $height; //高度
private $num; //驗證碼字數
private $imgType; //產生圖片類型
private $Type; //字串類型 1,2,3 三個選項 1 純數字 2 純小寫字母 3 大小寫數字混合
private $hb; //畫布
public $codestr; // 驗證碼字串 public function __construct($height=20,$num=4,$imgType="jpeg",$Type=1){
$this->width = $num*20;
$this->height = $height;
$this->num = $num;
$this->imgType = $imgType;
$this->Type = $Type;
$this->codestr = $this->codestr();
$this->zuhe();
} // 2. 定義隨機擷取字串函數
private function codestr(){
switch($this->Type){ case 1: // 類型為1 擷取1-9隨機數
$str = implode("",array_rand(range(0,9),$this->num));
break;
case 2: // 類型為2 擷取a-z隨機小寫字母
$str = implode("",array_rand(array_flip(range(a,z)),$this->num));
break;
case 3: // 類型為3 擷取數字,小寫字母,大寫字母 混合
for($i=0;$i<$this->num;$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. 初始化畫布映像資源
private function Hb(){
$this->hb = imagecreatetruecolor($this->width,$this->height);
}
// 4. 產生背景顏色
private function Bg(){
return imagecolorallocate($this->hb,rand(130,250),rand(130,250),rand(130,250));
} // 5. 產生字型顏色
private function Font(){
return imagecolorallocate($this->hb,rand(0,100),rand(0,100),rand(0,100));
} // 6. 填充背景顏色
private function BgColor(){
imagefilledrectangle($this->hb,0,0,$this->width,$this->height,$this->Bg());
} // 7. 幹擾點
private function ganrao(){
$sum=floor(($this->width)*($this->height)/3);
for($i=0;$i<$sum;$i++){
imagesetpixel($this->hb,rand(0,$this->width),rand(0,$this->height),$this->Bg());
}
} // 8. 隨機直線 弧線
private function huxian(){
for($i=0;$i<$this->num;$i++){
imageArc($this->hb,rand(0,$this->width),rand(0,$this->height),rand(0,$this->width),rand(0,$this->height),rand(0,360),rand(0,360),$this->Bg());
}
} // 9. 寫字
private function xiezi(){
for($i=0;$i<$this->num;$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. 輸出
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庫沒有此類映像");
}
} // 11. 拼裝
private function zuhe(){
$this->Hb();
$this->BgColor();
$this->ganrao();
$this->huxian();
$this->xiezi();
$this->OutImg();
} public function getCodeStr(){
return $this->codestr;
}
}
?> |
