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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
 
/* 
 * 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

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