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//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*/