一個php驗證碼的封裝類

/**
* 驗證碼類別
* edit bbs.it-home.org
*/
class ValidationCode {
private $width;private $height;
private $codeNum;
private $image; //影像資源
private $disturbColorNum;
private $checkCode;
function __construct(>private $checkCode;
function __construct(ight =20, $codeNum=4){
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
$this ->checkCode=$this->createCheckCode();
$number=floor($width*$height/15);
if($number > 240-$codeNum){
$this->disturbColorNum= 240-$codeNum;
}else{
$this->disturbColorNum=$number;
}
}
 //透過存取該方法向瀏覽器輸出圖像
function showImage($fontFace=""){
//第一步：建立圖像背景
$this->createImage();
//第二步：設定乾擾元素
$this->setDisturbColor();
//第三個步驟：隨機畫出文字
$this->outputText($fontFace);
//第四步：輸出影像
$this->outputImage();
}
//透過呼叫此方法取得隨機建立的驗證碼字串
function getCheckCode(){
return $this->checkCode;
}
private function createImage(){
//建立映像資源//bbs.it-home.org
$this->image=imagecreatetruecolor($this->width, $this->height);
//隨機背景色
$backColor=imagecolorallocate($this->image, rand(225, 255) , rand(225,255), rand(225, 255));
//為背景增加顏色
imagefill($this->image, 0, 0, $backColor);
//設定邊框顏色
$border=imagecolorallocate($this->image, 0, 0, 0);
//畫出長方形邊框
imagerectangle($this->image, 0, 0, $this-> width-1, $this->height-1, $border);
}
private function setDisturbColor(){
for($i=0; $idisturbColorNum; $i++ ){
$color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->image, rand (1, $this->width-2), rand(1, $this->height-2), $color);
}
for($i=0; $i$color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));
imagearc($this->image, rand (-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);
}
}
private function createCheckCode(){
//這裡主要產生隨機碼，從2開始是為了區分1和l
$code="23456789abcdefghijkmnpqrstuvwxyz$code="23456789abcdefghijkmnpqrstuvwxyz$code="23456789abcdefghijkmnpqrstuvwxyzDEWxg ;
for($i=0; $i codeNum; $i++){
$char=$code{rand(0, strlen($code)-1)};
 $string.=$char;
}
return $string;
}
private function outputText($fontFace=""){
for($i=0; $icodeNum; $i++){
$fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));
if( $fontFace==""){
$fontsize=rand(3, 5);
$x=floor($this->width/$this->codeNum)*$i+3;
 $y=rand(0, $this->height-15);
imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);
}else{
$fontsize=rand(12, 16);
$x=floor(($this->width-8)/$this->codeNum)*$i+8;
$y=rand($fontSize+5, $this->height);
imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
}
}
}
//輸出圖象資訊
private function outputImage() {
if(imagetypes() & IMG_GIF){
header("Content-Type:image/gif");
imagepng($this->image);
}else if(imagetypes( ) & IMG_JPG){
header("Content-Type:image/jpeg");
imagepng($this->image); //bbs.it-home.org
}else if(imagetypes () & IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}else if(imagetypes() & IMG_WBMP){
}else if(imagetypes() & IMG_WBMP){
header("Content-Type:image/vnd.wap.wbmp");
imagepng($this->image);
}else{
die("PHP不支援影像建立");
}
}
function __destruct(){
imagedestroy($this->image);
}
}
?>
}

複製程式碼

session_start();
include "validationcode.class.php";
$code=new ValidationCode(80ationcode.class.php";