PHP程序员在进行网站开发时，通常都会遇到与权限验证相关的问题。下面我们就为大家具体介绍有关PHP全站权限验证的实现方法。#t#

PHP全站权限验证代码示例：

1. < html> 
2. < head>< title>e   
3. < /title> 
4. < /head> 
5. < body> 
6. < form action="login.php" 
   method="POST" > 

用户：

1. < input type="text" 
   name="username"> 
2. < br> 

密码：

1. < input type="password" 
   name="password"> 
2. < input type ="Submit"
    value ="确定"> 
3. < input type ="reset"
    value ="取消"> 
4. < /form> 
5. < /body> 
6. < /html> 

----------------conn.php--------------------------

1. < ?php  
2. $host='127.0.0.1';  
3. $mysql_user='root';  
4. $mysql_password='qeephp';  
5. $mydb='learn';  
6. $link = mysql_connect($host, 
   $mysql_user , $mysql_password)  
7. or die("无法连接数据库: " 
   . mysql_error());  
8. mysql_select_db($mydb);  
9. ?> 

----------------------------login.php------------------

< ?  
$username=$_POST['username'];  
$password=$_POST['password'];  
if ($username==""){  
echo "< script language='javascript'> 
alert('非法操作!'); location.href=
'index.php'; < /script>";  
exit;  
}  
require_once("conn.php");  
$sql="SELECT * FROM admin where
 username='$username'";  
$result=mysql_query($sql);  
$row=mysql_fetch_array($result);  
if ($row['username']==""){  
echo "< script language='javascript'> 
alert('用户名有误!'); location.href=
'index.php'; < /script>";  
exit;  
}else if ($row['password']!=$password){  
echo "< script language='javascript'> 
alert('密码有误!'); location.href='index
.php'; < /script>";  
echo "密码有误";  
exit;  
}else{  
session_start();  
$_SESSION['user']=$username;  
echo "< script language='javascript'> 
alert('登陆成功!'); location.href=
'list.php'; < /script>";  
}  
?> 

------------------check.php--------------------

< ?  
session_start();   
if(! isset($_SESSION['user']))   
{   
echo "< script language='javascript'> 
alert('非法操作!'); location.href=
'index.php'; < /script>";  
exit;  
}else{  
echo "欢迎".$_SESSION['user']
."登录系统";   
}  
?> 

---------------------list.php-----------------

< ?  
include 'check.php';  
?> 
< html> 
< head> 
< script type="text/javascript" 
src="player/swfobject.js">< /script> 
< /head> 
< body> 
< h3>单个文件播放:< /h3> 
< p id="player1">< a href="
http://www.macromedia.com/go/
getflashplayer">获取播放器< /a> 观看电影< /p> 
< script type="text/javascript"> 
var s1 = new SWFObject("player/
flvplayer.swf","single","300","170","7");  
s1.addParam("allowfullscreen","true");  
s1.addVariable("file","player/ad.flv");  
s1.addVariable("image","player/preview.jpg");  
s1.addVariable("width","300");  
s1.addVariable("height","170");  
s1.write("player1");  
< /script> 
< h3>playlist file, with different 
colors:< /h3> 
< p id="player2">< a href="http:
//www.macromedia.com/go/getflashplayer">
Get the Flash Player< /a> to see this player.< /p> 
< script type="text/javascript"> 
var s2 = new SWFObject("player/flvplayer
.swf","playlist","300","312","7");  
s2.addParam("allowfullscreen","true");  
s2.addVariable("file","player/playlist.xml");  
s2.addVariable("displayheight","200");  
s2.addVariable("backcolor","0x000000");  
s2.addVariable("frontcolor","0xCCCCCC");  
s2.addVariable("lightcolor","0x557722");  
s2.addVariable("width","300");  
s2.addVariable("height","312");  
s2.write("player2");  
< /script> 
< /body> 
< /html> 

--------------------logout.php-------------------------

< ?php   
unset($_SESSION['user']);   
unset($_SESSION['password']);   
echo "注销成功";   
?> 

以上就是PHP全站权限验证的具体实现方法。