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一个漂亮的php验证码类(分享)

Jun 06, 2016 pm 08:28 PM
php

下面小编就为大家分享一个漂亮的php验证码类。需要的朋友可以过来参考下

直接上代码:

复制代码 代码如下:


//验证码类
class ValidateCode {
 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
 private $code;//验证码
 private $codelen = 4;//验证码长度
 private $width = 130;//宽度
 private $height = 50;//高度
 private $img;//图形资源句柄
 private $font;//指定的字体
 private $fontsize = 20;//指定字体大小
 private $fontcolor;//指定字体颜色
 //构造方法初始化
 public function __construct() {
  $this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字体路径要写对,香港虚拟主机,否则显示不了图片
 }
 //生成随机码
 private function createCode() {
  $_len = strlen($this->charset)-1;
  for ($i=0;$icodelen;$i++) {
   $this->code .= $this->charset[mt_rand(0,$_len)];
  }
 }
 //生成背景
 private function createBg() {
  $this->img = imagecreatetruecolor($this->width, $this->height);
  $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
  imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
 }
 //生成文字
 private function createFont() {
  $_x = $this->width / $this->codelen;
  for ($i=0;$icodelen;$i++) {
   $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
   imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
  }
 }
 //生成线条、雪花
 private function createLine() {
  //线条
  for ($i=0;$i   $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
   imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
  }
  //雪花
  for ($i=0;$i   $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
   imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
  }
 }
 //输出
 private function outPut() {
  header('Content-type:image/png');
  imagepng($this->img);
  imagedestroy($this->img);
 }
 //对外生成
 public function doimg() {
  $this->createBg();
  $this->createCode();
  $this->createLine();
  $this->createFont();
  $this->outPut();
 }
 //获取验证码
 public function getCode() {
  return strtolower($this->code);
 }
}


输出实例:

使用方法:
1、先把验证码类保存为一个名为 ValidateCode.class.php 的文件;
2、新建一个名为 captcha.php 的文件进行调用该类;
captcha.php

复制代码 代码如下:


session_start();
require './ValidateCode.class.php';  //先把类包含进来,香港服务器,实际路径根据实际情况进行修改。
$_vc = new ValidateCode();  //实例化一个对象
$_vc->doimg();  
$_SESSION['authnum_session'] = $_vc->getCode();//验证码保存到SESSION中


3、引用到页面中,代码如下:

复制代码 代码如下:


一个漂亮的php验证码类(分享)


4、一个完整的验证页面,代码如下:

复制代码 代码如下:


session_start();
//在页首先要开启session,
//error_reporting(2047);
session_destroy();
//将session去掉,虚拟主机,以每次都能取新的session值;
//用seesion 效果不错,也很方便
?>


session 图片验证实例



此例为session验证实例



验证码:

一个漂亮的php验证码类(分享)






//打印上一个session;
//echo "上一个session:".$_SESSION["authnum_session"]."
";
$validate="";
if(isset($_POST["validate"])){
$validate=$_POST["validate"];
echo "您刚才输入的是:".$_POST["validate"]."
状态:";
if($validate!=$_SESSION["authnum_session"]){
//判断session值与用户输入的验证码是否一致;
echo "输入有误";
}else{
echo "通过验证";
}
}
?>

完整demo下载:demo
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