php采用session实现防止页面重复刷新

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php采用session实现防止页面重复刷新_php技巧

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May 16, 2016 pm 08:02 PM

如何防止页面重复刷新，在php环境下可以利用session来轻松实现。

b.php的代码

<&#63;php

//只能通过post方式访问 
if ($_SERVER['REQUEST_METHOD'] == 'GET') 
{header('HTTP/1.1 404 Not Found'); die('亲,页面不存在');} 
session_start(); 
$fs1=$_POST['a']; 
$fs2=$_POST['b']; 
//防刷新时间,单位为秒 
$allowTime = 30; 
//读取访客ip，以便于针对ip限制刷新 
/*获取真实ip开始*/ 
if ( ! function_exists('GetIP')) 
{ 
function GetIP() 
{ 
static $ip = NULL; 
if ($ip !== NULL) 
{ 
return $ip; 
} 
if (isset($_SERVER)) 
{ 
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) 
{ 
$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']); 
/* 取X-Forwarded-For中第x个非unknown的有效IP字符&#63; */ 
foreach ($arr as $xip) 
{ 
$xip = trim($xip); 
if ($xip != 'unknown') 
{ 
$ip = $xip; 
break; 
} 
} 
} 
elseif (isset($_SERVER['HTTP_CLIENT_IP'])) 
{ 
$ip = $_SERVER['HTTP_CLIENT_IP']; 
} 
else 
{ 
if (isset($_SERVER['REMOTE_ADDR'])) 
{ 
$ip = $_SERVER['REMOTE_ADDR']; 
} 
else 
{ 
$ip = '0.0.0.0'; 
} 
} 
} 
else 
{ 
if (getenv('HTTP_X_FORWARDED_FOR')) 
{ 
$ip = getenv('HTTP_X_FORWARDED_FOR'); 
} 
elseif (getenv('HTTP_CLIENT_IP')) 
{ 
$ip = getenv('HTTP_CLIENT_IP'); 
} 
else 
{ 
$ip = getenv('REMOTE_ADDR'); 
} 
} 
preg_match("/[\d\.]{7,15}/", $ip, $onlineip); 
$ip = ! empty($onlineip[0]) &#63; $onlineip[0] : '0.0.0.0'; 
return $ip; 
} 
} 
/*获取真实ip结束*/ 
$reip = GetIP(); 
//相关参数md5加密 
$allowT = md5($reip.$fs1.$fs2); 
if(!isset($_SESSION[$allowT])){ 
$_SESSION[$allowT] = time(); 
} 
else if(time() - $_SESSION[$allowT]-->$allowTime){ 
$_SESSION[$allowT] = time(); 
} 
//如果刷新过快，则直接给出404header头以及提示 
else {header('HTTP/1.1 404 Not Found'); die('来自'.$ip.'的亲,您刷新过快了');} 
&#63;>

代码很简单，无非是把ip，以及通过POST方式提交到需要防刷新页面的数据经过md5加密后写入session中，再通过存储的session来判断刷新时间间隔从而决定是否允许刷新。需要说明的是"$fs1=$_POST['a'];"、"$fs1=$_POST['a'];"两个参数是指其他页面通过post方式提交到需要防刷新页的参数。之所以除了ip之外还要加这些参数的原因是为了区别不同的post结果。（实际上所谓的防刷新也就是防止某一页面被反复提交。）

更具体的说，比如上述代码放在b.php页面的开头，我们在a.html页面有一个如下表单：

代码:

<!DOCTYPE> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>b.html</title> 
</head> 
<body> 
<form action="b.php" method="post" > 
<input type="hidden" id="a" name="a" value="a"/> 
<input type="hidden" id="b" name="b" value="b"/> 
<button name="" type="submit" >提交</button> 
</form> 
</body> 
</html>

可以看到这个页面提交的a和b 2个参数正是前面b.php中的2个参数（实际上应该反过来说，由提交页面的参数来决定)。在前面的php代码中，已经确定只能通过post访问被提交数据的页面，所以直接输入地址会得到一个404头的错误页面，只能通过post方式来得到页面，同时post刷新的时候会自己带上参数地址，这样就实现了同一页面每个ip的防止刷新效果。

另外我们可以在被post的页面增加通过referer判定来源网站，防止跨站提交，不过referer可以伪造，而且firefox和ie8经常莫名其妙出现referer丢失的情况，所以暂时也就不加这个代码。

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