在php会话变量中设置javascript变量 [英] Set the javascript variable in php session variable

问题描述

我想基于用户浏览器时间设置php会话 $ _ SESSION ['time']

I want to set the php session $_SESSION['time'] based on user browser time

 // gives time difference between utc time and current user local time
var offset = ((new Date().getTimezoneOffset()) * -1) * 60;

我希望将此偏移值存储在会话变量中，例如

I want this offset value to be stored in a session variable like

$_SESSION['time'] = offset ; // something like this

示例

 <script type="text/javascript">
   I have to set the $SESSION['time'] variable at the beginning of page
   so that i can use it down the dom
 </script>
 <span class="time_stamp"><?php echo $_SESSION['time'];?></span> 

推荐答案

在服务器上的页面加载时会创建一个php会话.因此，无法在页面加载后创建会话.

A php session is created at the page load on the server. so there is no way to create the session after the page has loaded.

因此，如果您不想使用ajax，则只有一个/2解决方案.

so you have only one/2 solution if you don't want to use ajax.

解决方案1 ​​

sess.php

<?php
 session_start();
 $_SESSION['time']=$_GET['time'];
?>

js

head.appendChild(document.createElement('script')).src='sess.php?time='+offset;

note:head在这种情况下只是一个参考.

note:head is only a reference in this case.

但是

这也是异步的.

再说一次.页面加载后无法设置会话.

so again. there is no way to set the session after the page has loaded.

解决方案2

使用gd预加载php输出的图像，该图像也会设置您的会话.;)

如果您想知道我如何看待它(这将导致自然的页面加载，并且也将在ie6上正常工作)我只是不记得确切地在身体做完之前如何预加载图像了

if you want to know how i can look into it.(this would cause a natural page load & would prolly work also on ie6 )i just don't remember exactly how to preload images before the body does.

前段时间我遇到了同样的问题...我使用ajax.

I had the same problem some time ago ... i use ajax.

function ajax(a,b,c){ // Url, Callback, just a placeholder
 c=new XMLHttpRequest;
 c.open('GET',a);
 c.onload=b;
 c.send()
}
function LoadThePage(){
 //just some milliseconds passed.
 //session is set
 //load the rest of your page.
 //MOST OF THE TIME this loads faster than the body does.(window.onload)
}
ajax('sess.php?time='+offset,LoadThePage);

另一方面...现在大多数现代浏览器都支持本地存储.

at the other side ... now most modern browsers support localstorage.

所有电话和现代的浏览器.

all phones & the modern browsers.

如果我存储这样的东西.为什么要使用php会话?

if i store things like that. why use a php session?

进行本地存储来代替它.

localstorage is made to replace that.

window.localStorage['offset']=((new Date().getTimezoneOffset()) * -1) * 60;

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