从PHP访问JavaScript变量 [英] Access a JavaScript variable from PHP

问题描述

我需要使用 PHP 访问 JavaScript 变量。这是我正在尝试的代码的精简版本，它无法正常工作：

I need to access a JavaScript variable with PHP. Here's a stripped-down version of the code I'm currently trying, which isn't working:

<script type="text/javascript" charset="utf-8">
    var test = "tester";
</script>

<?php
    echo $_GET['test'];
?>

我对JavaScript和PHP都是全新的，所以我非常感谢任何建议。

I'm a completely new to both JavaScript and PHP, so I would really appreciate any advice.

更新：好的，我想我简化了太多。我要做的是创建一个表单，在提交时更新Twitter状态。我的表单工作正常，但我还要添加地理位置数据。由于我使用Javascript（特别是Google Geolocation API）来获取位置，在提交表单时如何使用PHP访问该信息？

UPDATE: OK, I guess I simplified that too much. What I'm trying to do is create a form that will update a Twitter status when submitted. I've got the form working OK, but I want to also add geolocation data. Since I'm using Javascript (specifically, the Google Geolocation API) to get the location, how do I access that information with PHP when I'm submitting the form?

推荐答案

简短的回答是你不能。

我不知道任何PHP语法，但我可以告诉你的是，PHP在服务器上执行，JavaScript在客户端上执行（在浏览器上）。

I don't know any PHP syntax, but what I can tell you is that PHP is executed on the server and JavaScript is executed on the client (on the browser).

你正在做$ _GET，用于检索表单值：

You're doing a $_GET, which is used to retrieve form values:

内置$ _GET函数用于使用method =get收集表单中的值。

The built-in $_GET function is used to collect values in a form with method="get".

换句话说，如果你的页面上有：

In other words, if on your page you had:

<form method="get" action="blah.php">
    <input name="test"></input>
</form>

您的$ _GET调用将检索该输入字段中的值。

Your $_GET call would retrieve the value in that input field.

那么如何从JavaScript中检索一个值？

So how to retrieve a value from JavaScript?

好吧，你可以将javascript值粘贴在隐藏的表单字段中......

Well, you could stick the javascript value in a hidden form field...

<script type="text/javascript" charset="utf-8">
    var test = "tester";
    // find the 'test' input element and set its value to the above variable
    document.getElementByID("test").value = test;
</script>

... elsewhere on your page ...

<form method="get" action="blah.php">
    <input id="test" name="test" visibility="hidden"></input>
    <input type="submit" value="Click me!"></input>
</form>

然后，当用户点击您的提交按钮时，他/她将发出GET请求到blah.php，发送'test'中的值。

Then, when the user clicks your submit button, he/she will be issuing a "GET" request to blah.php, sending along the value in 'test'.

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