文件f.php代码
<!DOCTYPE html>
<html lang="en">
<head>
<!-- 简单的表单提交代码 -->
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>简单验证码的实现</title>
</head>
<body>
<form method="post" action="">
帐号:<input type="text" name="user">
密码:<input type="password" name="pass">
<p>验证码图片:<img src="code.php" onClick="this.src='code.php?nocache='+Math.random()" style="cursor:hand" alt="点击换一张"/>点击图片可更换验证码</p>
<p>请输入图片中的内容:<input type="text" name="authcode" value=""/></p>
<p><input type="submit" width="20px" height=19px value="提交"></input></p>
</form>
</body>
</html>
<?php
include('b/config/conn.php');
header("Content-type: text/html; charset=utf-8");
// session 存值并匹配用户输入值
if (isset($_REQUEST['authcode'])) {
session_start();
if (strtolower($_REQUEST['authcode'])==$_SESSION['authcode']) {//strtolower转化为小写的函数
echo"输入正确!";
$username=$_POST['user'];
$password=md5($_POST['pass']);
$sql="select * from sy_adminuser where username='$username' and password='$password'";
$result=mysql_query($sql,$conn);
if(mysql_num_rows($result)){
$row=mysql_fetch_array($result);
echo '成功!';
session_start();
$_SESSION['user']=$row['username'];//讲查询结果的数据进行赋值
header("Location: b/cookie/new.php");
}else{
echo '失败!';
//header("Location: login.php");
}
# code...
}
else{
echo"输入错误!";
}
exit();
}
?>
/new.php文件代码
<?php
header("Content-Type:text/html;charset=utf-8");
session_start();
if ($_SESSION['user']=='admin'){
echo '你是管理员';
}else{
echo '你不是管理员';
}
conn.php文件代码
<?php
$conn=mysql_connect('localhost','root','root');
mysql_select_db('syguestbook',$conn);
?>
code.php文件代码
<?php
session_start();//必须位于脚本的最顶端
$image=imagecreatetruecolor(100, 30);//imagecreatetruecolor函数建一个真彩色图像
//生成彩色像素
$bgcolor=imagecolorallocate($image, 255, 255, 255);//白色背景 imagecolorallocate函数为一幅图像分配颜色
$textcolor=imagecolorallocate($image,0,0,255);//蓝色文本
//填充函数,xy确定坐标,color颜色执行区域填充颜色
imagefill($image, 0, 0, $bgcolor);
$captch_code="";//初始空值
//该循环,循环取数
for($i=0;$i<4;$i++){
$fontsize=6;
$x=($i*25)+rand(5,10);
$y=rand(5,10);//位置随机
// $fontcontent=$i>2?chr(rand(97,122)):chr(rand(65,90));//是小写,否则是大写
$data='abcdefghijkmnpqrstuvwxyz3456789';
$fontcontent=substr($data,rand(0,strlen($data)-1),1);
$fontcolor=imagecolorallocate($image,rand(0,100),rand(0,100),rand(0,100));//随机的rgb()值可以自己定
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); //水平地画一行字符串
$captch_code.=$fontcontent;
}
$_SESSION['authcode']=$captch_code;//将变量保存再session的authcode变量中
//该循环,循环画背景干扰的点
for($m=0;$m<=600;$m++){
$x2=rand(1,99);
$y2=rand(1,99);
$pointcolor=imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($image,$x2,$y2,$pointcolor);// 水平地画一串像素点
}
//该循环,循环画干扰直线
for ($i=0;$i<=10;$i++){
$x1=rand(0,99);
$y1=rand(0,99);
$x2=rand(0,99);
$y2=rand(0,99);
$linecolor=imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
imageline($image,$x1,$y1,$x2,$y2,$linecolor);//画一条线段
}
header('content-type:image/png');
imagepng($image);
//销毁
imagedestroy($image);
?>