PHP编写的图片验证码类文件分享


Posted in PHP onJune 06, 2016

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
PHP 相关文章推荐
一个简单计数器的源代码
Oct 09 PHP
PHP 错误之引号中使用变量
May 04 PHP
关于php fread()使用技巧
Jan 22 PHP
php小偷相关截取函数备忘
Nov 28 PHP
php使用递归函数实现数字累加的方法
Mar 16 PHP
php使用Jpgraph绘制饼状图的方法
Jun 10 PHP
php正则替换处理HTML页面的方法
Jun 17 PHP
浅谈PDO的rowCount函数
Jun 18 PHP
php基于dom实现读取图书xml格式数据的方法
Feb 03 PHP
PHP hex2bin()函数用法讲解
Feb 25 PHP
Laravel事件监听器用法实例分析
Mar 12 PHP
有关PHP 中 config.m4 的探索
Aug 26 PHP
Laravel框架实现发送短信验证功能代码
Jun 06 #PHP
JSON字符串传到后台PHP处理问题的解决方法
Jun 05 #PHP
PHP获取指定时间段之间的 年,月,天,时,分,秒
Jun 05 #PHP
php 如何获取文件的后缀名
Jun 05 #PHP
PHP常用文件操作函数和简单实例分析
Jun 03 #PHP
PHP读取大文件末尾N行的高效方法推荐
Jun 03 #PHP
PHP中读取文件的几个方法总结(推荐)
Jun 03 #PHP
You might like
php通过curl模拟登陆DZ论坛
2015/05/11 PHP
Lumen timezone 时区设置方法(慢了8个小时)
2018/01/20 PHP
图片上传即时显示缩略图的js代码
2009/05/27 Javascript
jquery 日期分离成年月日的代码
2010/05/14 Javascript
jQuery实现仿Google首页拖动效果的方法
2015/05/04 Javascript
详解Bootstrap按钮
2016/01/04 Javascript
谷歌showModalDialog()方法不兼容出现对话窗口的解决办法
2016/02/15 Javascript
vue.js通过自定义指令实现数据拉取更新的实现方法
2016/10/18 Javascript
Vue实现virtual-dom的原理简析
2017/07/10 Javascript
axios拦截设置和错误处理方法
2018/03/05 Javascript
mock.js实现模拟生成假数据功能示例
2019/01/15 Javascript
Element-ui中元素滚动时el-option超出元素区域的问题
2019/05/30 Javascript
js获取浏览器地址(获取第1个斜杠后的内容)
2019/09/03 Javascript
React生命周期原理与用法踩坑笔记
2020/04/28 Javascript
解决vue无法侦听数组及对象属性的变化问题
2020/07/17 Javascript
[48:39]Ti4主赛事胜者组第一天 EG vs NEWBEE 2
2014/07/19 DOTA
[09:34]2018DOTA2国际邀请赛寻真——永不放弃的iG
2018/08/14 DOTA
Django的URLconf中使用缺省视图参数的方法
2015/07/18 Python
Django admin美化插件suit使用示例
2017/12/12 Python
Selenium 模拟浏览器动态加载页面的实现方法
2018/05/16 Python
python使用MQTT给硬件传输图片的实现方法
2019/05/05 Python
Python搭建代理IP池实现获取IP的方法
2019/10/27 Python
Python 面向对象之类class和对象基本用法示例
2020/02/02 Python
python模式 工厂模式原理及实例详解
2020/02/11 Python
基于python实现音乐播放器代码实例
2020/07/01 Python
python中str内置函数用法总结
2020/12/27 Python
Canvas与图片压缩的示例代码
2017/11/28 HTML / CSS
运行时异常与一般异常有何异同?
2014/01/05 面试题
JAVA中的关键字有什么特点
2014/03/07 面试题
英文版银行求职信
2013/10/09 职场文书
保安拾金不昧表扬信
2014/01/15 职场文书
园艺师求职信
2014/03/10 职场文书
优秀大专毕业生求职信
2014/08/04 职场文书
城南旧事读书笔记
2015/06/29 职场文书
2016年大学迎新工作总结
2015/10/14 职场文书
详解Go与PHP的语法对比
2021/05/29 PHP