PHP编写的图片验证码类文件分享
适用于自定义的验证码类！
<?php
/*
*Tochangethislicenseheader,chooseLicenseHeadersinProjectProperties.
*Tochangethistemplatefile,chooseTools|Templates
*andopenthetemplateintheeditor.
*/
ClassImage{
private$img;
public$width=85;
public$height=25;
public$code;
public$code_len=4;
public$code_str="329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";
public$bg_color='#DCDCDC';
public$font_size=16;
public$font='font.ttf';
public$font_color='#000000';
//创建验证码饿字符创
publicfunctioncreate_code(){
$code='';
for($i=0;$i<$this->code_len;$i++){
$code.=$this->code_str[mt_rand(0,strlen($this->code_str)-1)];
}
return$this->code=$code;
}
//输出图像
publicfunctiongetImage(){
$w=$this->width;
$h=$this->height;
$bg_color=$this->bg_color;
$img=imagecreatetruecolor($w,$h);
$bg_color=imagecolorallocate($img,
hexdec(substr($bg_color,1,2)),hexdec(substr($bg_color,3,2)),hexdec(substr($bg_color,5,2)));
imagefill($img,0,0,$bg_color);
$this->img=$img;
$this->create_font();
$this->create_pix();
$this->show_code();
}
//写入验证码
publicfunctioncreate_font(){
$this->create_code();
$color=$this->font_color;
$font_color=imagecolorallocate($this->img,hexdec(substr($color,1,2)),hexdec(substr($color,3,2)),hexdec(substr($color,5,2)));
$x=$this->width/$this->code_len;
for($i=0;$i<$this->code_len;$i++){
$txt_color=imagecolorallocate($this->img,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));
imagettftext($this->img,$this->font_size,mt_rand(-30,30),$x*$i+mt_rand(3,6),mt_rand($this->height/1.2,$this->height),$txt_color,$this->font,$this->code[$i]);
//imagestring($this->img,$this->font_size,$x*$i+mt_rand(3,6),mt_rand(0,$this->height/4),$this->code[$i],$font_color);
}
$this->font_color=$font_color;
}
//画干扰线
publicfunctioncreate_pix(){
$pix_color=$this->font_color;
for($i=0;$i<100;$i++){
imagesetpixel($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),$pix_color);
}
for($j=0;$j<4;$j++){
imagesetthickness($this->img,mt_rand(1,2));
imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$pix_color);
}
}
//得到验证码
publicfunctiongetCode(){
returnstrtoupper($this->code);
}
//输出验证码
privatefunctionshow_code(){
header("Content-type:image/png");
imagepng($this->img);
imagedestroy($this->img);
}
}
我们再来看一例代码：
生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码
<?php
/**
*图片验证码类
*生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码
*
*使用方法：
*$captcha=newCatpcha();
*$captcha->buildAndExportImage();
*
*作者:luojing
*创建时间:2013-3-27上午11:42:12
*/
classCaptcha{
private$width;//宽度
private$height;//高度
private$codeNum;//验证码字符数量
private$image;//验证码图像资源
private$sessionKey;//session中保存的名字
private$captcha;//验证码字符串
constcharWidth=10;//单个字符宽度,根据输出字符大小而变
/**
*创建验证码类，初始化相关参数
*@param$width图片宽度
*@param$height图片高度
*@param$codeNum验证码字符数量
*@param$sessionKeysession中保存的名字
*/
function__construct($width=50,$height=20,$codeNum=4,$sessionKey='captcha'){
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
$this->sessionKey=$sessionKey;
//保证最小高度和宽度
if($height<20){
$this->height=20;
}
if($width<($codeNum*self::charWidth+10)){//左右各保留5像素空隙
$this->width=$codeNum*self::charWidth+10;
}
}
/**
*构造并输出验证码图片
*/
publicfunctionbuildAndExportImage(){
$this->createImage();
$this->setDisturb();
$this->setCaptcha();
$this->exportImage();
}
/**
*构造图像，设置底色
*/
privatefunctioncreateImage(){
//创建图像
$this->image=imagecreatetruecolor($this->width,$this->height);
//创建背景色
$bg=imagecolorallocate($this->image,mt_rand(220,255),mt_rand(220,255),mt_rand(220,255));
//填充背景色
imagefilledrectangle($this->image,0,0,$this->width-1,$this->height-1,$bg);
}
/**
*设置干扰元素
*/
privatefunctionsetDisturb(){
//设置干扰点
for($i=0;$i<150;$i++){
$color=imagecolorallocate($this->image,mt_rand(150,200),mt_rand(150,200),mt_rand(150,200));
imagesetpixel($this->image,mt_rand(5,$this->width-10),mt_rand(5,$this->height-3),$color);
}
//设置干扰线
for($i=0;$i<10;$i++){
$color=imagecolorallocate($this->image,mt_rand(150,220),mt_rand(150,220),mt_rand(150,220));
imagearc($this->image,mt_rand(-10,$this->width),mt_rand(-10,$this->height),mt_rand(30,300),mt_rand(20,200),55,44,$color);
}
//创建边框色
$border=imagecolorallocate($this->image,mt_rand(0,50),mt_rand(0,50),mt_rand(0,50));
//画边框
imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border);
}
/**
*产生并绘制验证码
*/
privatefunctionsetCaptcha(){
$str='23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
//生成验证码字符
for($i=0;$i<$this->codeNum;$i++){
$this->captcha.=$str{mt_rand(0,strlen($str)-1)};
}
//绘制验证码
for($i=0;$i<strlen($this->captcha);$i++){
$color=imagecolorallocate($this->image,mt_rand(0,200),mt_rand(0,200),mt_rand(0,200));
$x=floor(($this->width-10)/$this->codeNum);
$x=$x*$i+floor(($x-self::charWidth)/2)+5;
$y=mt_rand(2,$this->height-20);
imagechar($this->image,5,$x,$y,$this->captcha{$i},$color);
}
}
/*
*输出图像,验证码保存到session中
*/
privatefunctionexportImage(){
if(imagetypes()&IMG_GIF){
header('Content-type:image/gif');
imagegif($this->image);
}elseif(imagetypes()&IMG_PNG){
header('Content-type:image/png');
imagepng($this->iamge);
}elseif(imagetypes()&IMG_JPEG){
header('Content-type:image/jpeg');
imagepng($this->iamge);
}else{
imagedestroy($this->image);
die("Don'tsupportimagetype!");
}
//将验证码信息保存到session中，md5加密
if(!isset($_SESSION)){
session_start();
}
$_SESSION[$this->sessionKey]=md5($this->captcha);
imagedestroy($this->image);
}
function__destruct(){
unset($this->width,$this->height,$this->codeNum,$this->captcha);
}
}
例三：
<?php
classValidationCode{
private$width;
private$height;
private$codeNum;
private$image;//图像资源
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;
}
}
//通过访问该方法向浏览器中输出图像
functionshowImage($fontFace=""){
//第一步：创建图像背景
$this->createImage();
//第二步：设置干扰元素
$this->setDisturbColor();
//第三步：向图像中随机画出文本
$this->outputText($fontFace);
//第四步：输出图像
$this->outputImage();
}
//通过调用该方法获取随机创建的验证码字符串
functiongetCheckCode(){
return$this->checkCode;
}
privatefunctioncreateImage(){
//创建图像资源
$this->image=imagecreatetruecolor($this->width,$this->height);
//随机背景色
$backColor=imagecolorallocate($this->image,rand(225,255),rand(225,255),rand(225,255));
//为背景添充颜色
imagefill($this->image,0,0,$backColor);
//设置边框颜色
$border=imagecolorallocate($this->image,0,0,0);
//画出矩形边框
imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border);
}
privatefunctionsetDisturbColor(){
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);
}
}
privatefunctioncreateCheckCode(){
//这里主要产生随机码，从2开始是为了区分1和l
$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string='';
for($i=0;$i<$this->codeNum;$i++){
$char=$code{rand(0,strlen($code)-1)};
$string.=$char;
}
return$string;
}
privatefunctionoutputText($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{$i});
}
}
}
privatefunctionoutputImage(){
if(imagetypes()&IMG_GIF){
header("Content-Type:image/gif");
imagepng($this->image);
}elseif(imagetypes()&IMG_JPG){
header("Content-Type:image/jpeg");
imagepng($this->image);
}elseif(imagetypes()&IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}elseif(imagetypes()&IMG_WBMP){
header("Content-Type:image/vnd.wap.wbmp");
imagepng($this->image);
}else{
die("PHP不支持图像创建");
}
}
function__destruct(){
imagedestroy($this->image);
}
}
使用如下：
测试，调用验证码类
code.php
<?php session_start(); include"validationcode.class.php"; $code=newValidationCode(80,20,4); $code->showImage();//输出到页面中供注册或登录使用 $_SESSION["code"]=$code->getCheckCode();//将验证码保存到服务器中