//第一段代码生成随机图片------code2.php
- <?php
- //开启session以用于保存生成的内容
- session_start();
- $table=array(
- "pic0"=>"dog",
- "pic1"=>"cat",
- "pic2"=>"fish",
- "pic3"=>"bird"
- );
- $index=rand(0,3);
- $value=$table['pic'.$index];
- $_SESSION['authcode']=$value;
- //得到随机生成的图片名
- $filename=dirname(__FILE__).'/pic'.$index.'.jpg';
- $content=file_get_contents($filename);
- header('Content-type:image/jpg');
- echo $content;
- ?>
//第二段代码实线表单的验证
- <?php
- if(isset($_REQUEST['authcode'])){
- session_start();
- if($_REQUEST['authcode']==$_SESSION['authcode']){
- echo "right";
- }else{
- echo "sad story<br/>";
- echo $_REQUEST['authcode'];
- }
- }
- ?>
- <!DOCTYPE html>
- <html>
- <head>
- <title></title>
- </head>
- <body>
- <form action="./code1.php" method="post">
- <p>picture:<img id="cap_img" border="1" src="./code2.php?r=<?php echo rand(); ?>" width="100" height="30" /> </p>
- <br/>
- //通过js切换另外一张图片
- <a href="javascript:void(0)" onclick="document.getElementById('cap_img').src='./code2.php?r='+Math.random()">change picture</a>
- <p>words:<input type="text" name="authcode" value="" /></p>
- <p><input type="submit" value="sub"></p>
- </form>
- </body>
- </html>
- ?>
/*代码的路径是linux的路径*/
来源: http://www.phpxs.com/code/1003003/