时间:2021-07-01 10:21:17 帮助过:4人阅读
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); } }
- //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,否则显示不了图片
- }
- //生成随机码
- private function createCode() {
- $_len = strlen($this->charset)-1;
- for ($i=0;$i<$this->codelen;$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;$i<$this->codelen;$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;$i<6;$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<100;$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);
- }
- }
- //
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
3、引用到页面中,代码如下:
4、一个完整的验证页面,代码如下:
- <?php
- session_start();
- //在页首先要开启session,
- //error_reporting(2047);
- session_destroy();
- //将session去掉,以每次都能取新的session值;
- //用seesion 效果不错,也很方便
- ?>
- <html>
- <head>
- <title>session 图片验证实例</title>
- <style type="text/css">
- #login p{
- margin-top: 15px;
- line-height: 20px;
- font-size: 14px;
- font-weight: bold;
- }
- #login img{
- cursor:pointer;
- }
- form{
- margin-left:20px;
- }
- </style>
- </head>
- <body>
- <form id="login" action="" method="post">
- <p>此例为session验证实例</p>
- <p>
- <span>验证码:</span>
- <input type="text" name="validate" value="" size=10>
- <img title="点击刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
- </p>
- <p>
- <input type="submit">
- </p>
- </form>
- <?php
- //打印上一个session;
- //echo "上一个session:<b>".$_SESSION["authnum_session"]."</b><br>";
- $validate="";
- if(isset($_POST["validate"])){
- $validate=$_POST["validate"];
- echo "您刚才输入的是:".$_POST["validate"]."<br>状态:";
- if($validate!=$_SESSION["authnum_session"]){
- //判断session值与用户输入的验证码是否一致;
- echo "<font color=red>输入有误</font>";
- }else{
- echo "<font color=green>通过验证</font>";
- }
- }
- ?>
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