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.*To

适用于自定义的验证码类！

<?php
 
/* 
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
Class Image{
 
 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
 public function create_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
 public function getImage(){
 $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
 public function create_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
 public function create_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
 public function getCode(){
 return strtoupper($this->code);
 }
 
 
 //输出验证码
 private function show_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 = new Catpcha();
 * $captcha->buildAndExportImage();
 * 
 * 作 者: luojing
 * 创建时间: 2013-3-27 上午11:42:12
 */
class Captcha {
	
	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
	const charWidth = 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 $sessionKey session中保存的名字
 */
	function __construct($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
 */
	public function buildAndExportImage() {
 $this->createImage();
 $this->setDisturb();
 $this->setCaptcha();
 $this->exportImage();
	}
	
	/**
 * 构造图像，设置底色
 */
	private function createImage() {
 //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
 */
	private function setDisturb() {
 
 //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
 */
	private function setCaptcha() {
 $str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
 //生成验证码字符
 for($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
 */
	private function exportImage() {
 if(imagetypes() & IMG_GIF){
 header('Content-type:image/gif');
 imagegif($this->image);
 } else if(imagetypes() & IMG_PNG){
 header('Content-type:image/png'); 
 imagepng($this->iamge);
 } else if(imagetypes() & IMG_JPEG) {
 header('Content-type:image/jpeg'); 
 imagepng($this->iamge);
 } else {
 imagedestroy($this->image);
 die("Don't support image type!");
 }
 //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
 class ValidationCode {
 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
 function showImage($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
 function getCheckCode(){
 return $this->checkCode;
 }
 private function createImage(){
 //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, $border);
 }
 private function setDisturbColor(){
 for($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(){

//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 $string;
 }
 private function outputText($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=new ValidationCode(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