復(fù)制代碼 代碼如下:

<?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(guò)訪問(wèn)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(huà)出文本
$this->outputText($fontFace);
//第四步：輸出圖像
$this->outputImage();
}

//通過(guò)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(huà)出矩形邊框
imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
}
private function setDisturbColor(){
for($i=0; $i<$this->disturbColorNum; $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<10; $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(){
//這里主要產(chǎn)生隨機(jī)碼，從2開(kāi)始是為了區(qū)分1和l
$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string='';
for($i=0; $i < $this->codeNum; $i++){
$char=$code{rand(0, strlen($code)-1)};
$string.=$char;
}
return $string;
}
private function outputText($fontFace=""){
for($i=0; $i<$this->codeNum; $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);
}
}

復(fù)制代碼 代碼如下:

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