PHP 登录DEMO
logintest.php 页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
body{
margin:0;
padding:0;
background::#ccc;
font-family:'宋体',Simsun;
}
#wrap{
width:290px;
margin::17% auto;
}
#sid{
width:154px;
margin-left:-6px;
}
#sub{ margin-left:65px;}
#res{ margin-left:55px;}
#vcode{ float:right}
#welcome{font-size:20px; font-family:Comic Sans MS;
padding-bottom:5px;
}
</style>
</head>
<body>
<div id="wrap">
<div id="welcome">Welcome to mymessbox!</div>
<form action="checklogin.php" method="post">
选 择： <select name="loginname" id="sid">
<option value="manager">管理员</option>
<option value="user">用户</option>
</select>
<br>
用户名：<input type="text" name="username" id="">
<br>
密 码：<input type="password" name="password" id="">
<br>
验证码：<input type="text" name="vcode" id=""><img src="imgcodetest.php" id="vcode">
<br>
<input type="submit" value="login" id="sub">
<input type="reset" value="reset" id="res">
</form>
</div>
</body>
</html>
提交处理页面:
<?php
session_start();
$loginname=$_POST['loginname'];
$username=$_POST['username'];
$password=$_POST['password'];
$vcode = strtolower($_POST['vcode']);
$rcode = strtolower($_SESSION['rcode']);
echo $username."<br/>";
echo $rcode;
mysql_connect('localhost','root','root');
mysql_select_db("test");
mysql_query("set names=uft8");
if ($vcode !== $rcode) {
echo "<script>alert('the code is wrong!');window.location.href='logintest.php'</script>";
}
else {
if($username='Test')
{
$sql="select * from users where username='$username' and userpwd='$password'";
$result=mysql_query($sql);
$i=mysql_num_rows($result);
if( $i >=1){
$_SESSION['mgusername']=$username;
echo "<script> alert('login success')</script>";
}
else
{
echo "<script> alert('login fail'); </script>";
}
}
else
{
echo"<script>alert('用户名不对');</script>";
}
}
?>
验证码:
<?php
session_start();
//文件头...
header("Content-type: image/png");
//创建真彩色白纸
$im = @imagecreatetruecolor(50, 20) or die("建立图像失败");
//获取背景颜色
$background_color = imagecolorallocate($im, 255, 255, 255);
//填充背景颜色(这个东西类似油桶)
imagefill($im,0,0,$background_color);
//获取边框颜色
$border_color = imagecolorallocate($im,200,200,200);
//画矩形，边框颜色200,200,200
imagerectangle($im,0,0,49,19,$border_color);
//逐行炫耀背景，全屏用1或0
for($i=2;$i<18;$i++){
//获取随机淡色
$line_color = imagecolorallocate($im,rand(200,255),rand(200,255),rand(200,255));
//画线
imageline($im,2,$i,47,$i,$line_color);
}
//设置字体大小
$font_size=12;
//设置印上去的文字
$Str[0] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$Str[1] = "abcdefghijklmnopqrstuvwxyz";
$Str[2] = "01234567891234567890123456";
//获取第1个随机文字
$imstr[0]["s"] = $Str[rand(0,2)][rand(0,25)];
$imstr[0]["x"] = rand(2,5);
$imstr[0]["y"] = rand(1,4);
//获取第2个随机文字
$imstr[1]["s"] = $Str[rand(0,2)][rand(0,25)];
$imstr[1]["x"] = $imstr[0]["x"]+$font_size-1+rand(0,1);
$imstr[1]["y"] = rand(1,3);
//获取第3个随机文字
$imstr[2]["s"] = $Str[rand(0,2)][rand(0,25)];
$imstr[2]["x"] = $imstr[1]["x"]+$font_size-1+rand(0,1);
$imstr[2]["y"] = rand(1,4);
//获取第4个随机文字
$imstr[3]["s"] = $Str[rand(0,2)][rand(0,25)];
$imstr[3]["x"] = $imstr[2]["x"]+$font_size-1+rand(0,1);
$imstr[3]["y"] = rand(1,3);
$imgcode='';
//写入随机字串
for($i=0;$i<4;$i++){
//获取随机较深颜色
$text_color = imagecolorallocate($im,rand(50,180),rand(50,180),rand(50,180));
//画文字
$imgcode.=$imstr[$i]["s"];
imagechar($im,$font_size,$imstr[$i]["x"],$imstr[$i]["y"],$imstr[$i]["s"],$text_color);
}
//显示图片
$_SESSION['rcode']= $imgcode;
imagepng($im);
//销毁图片
imagedestroy($im);
?>
