封裝一個驗(yàn)證碼類
?validationcode.class.php
?class ValidationCode {
? private $width;
? private $height;
? private $codeNum;
? private $image;?? //圖像資源
? private $disturbColorNum;
? private $checkCode;
? function __construct($width=80, $height=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;
?? }
?
? }
? //通過訪問該方法向?yàn)g覽器中輸出圖像
? function showImage($fontFace=""){
?? //第一步：創(chuàng)建圖像背景
?? $this->createImage();
?? //第二步：設(shè)置干擾元素
?? $this->setDisturbColor();
?? //第三步：向圖像中隨機(jī)畫出文本
?? $this->outputText($fontFace);
?? //第四步：輸出圖像
?? $this->outputImage();
? }
??
? //通過調(diào)用該方法獲取隨機(jī)創(chuàng)建的驗(yàn)證碼字符串
? function getCheckCode(){
?? return $this->checkCode;
? }
? private function createImage(){
?? //創(chuàng)建圖像資源
?? $this->image=imagecreatetruecolor($this->width, $this->height);
?? //隨機(jī)背景色
?? $backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));
?? //為背景添充顏色
?? imagefill($this->image, 0, 0, $backColor);
?? //設(shè)置邊框顏色
?? $border=imagecolorallocate($this->image, 0, 0, 0);
?? //畫出矩形邊框
?? 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(){
?? $code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
?? $string='';
?? for($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});
??? }
?? }
? }
? 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);
?? }else if(imagetypes() & IMG_PNG){
??? header("Content-Type:image/png");
??? imagepng($this->image);
?? }else if(imagetypes() & IMG_WBMP){
??? header("Content-Type:image/vnd.wap.wbmp");
??? imagepng($this->image);
?? }else{
??? die("PHP不支持圖像創(chuàng)建");
?? }
? }
? function __destruct(){
?? imagedestroy($this->image);
? }
?}
?

調(diào)用驗(yàn)證碼類
code.php
session_start();
include "validationcode.class.php";
$code=new ValidationCode(80, 20, 4);
$code->showImage();?? //輸出到頁面中供 注冊或登錄使用
$_SESSION["code"]=$code->getCheckCode();? //將驗(yàn)證碼保存到服務(wù)器中