在JavaScript中访问PHP变量[重复]

Possible Duplicate:
How to access PHP variables in JavaScript or jQuery rather than <?php echo $variable ?>

可能重复：如何在JavaScript或jQuery中访问PHP变量而不是<？php echo $ variable？>

Is there any way to get access to a PHP variable in JavaScript?

有没有办法在JavaScript中访问PHP变量？

I have a variable, $a, in PHP and want to get its value in a JavaScript variable.

我在PHP中有一个变量$ a，想要在JavaScript变量中获取它的值。

3 个解决方案

#1

You can't, you'll have to do something like

你不能，你必须做类似的事情

<script type="text/javascript">
   var php_var = "<?php echo $php_var; ?>";
</script>

You can also load it with AJAX

您也可以使用AJAX加载它

rhino is right, the snippet lacks of a type for the sake of brevity.

犀牛是对的，为简洁起见，片段缺少一种类型。

Also, note that if $php_var has quotes, it will break your script. You shall use addslashes, htmlentities or a custom function.

另请注意，如果$ php_var有引号，它将破坏您的脚本。您应使用addslashes，htmlentities或自定义函数。

#2

metrobalderas is partially right. Partially, because the PHP variable's value may contain some special characters, which are metacharacters in JavaScript. To avoid such problem, use the code below:

metrobalderas部分正确。部分地，因为PHP变量的值可能包含一些特殊字符，这些字符是JavaScript中的元字符。要避免此类问题，请使用以下代码：

<script type="text/javascript">
var something=<?php echo json_encode($a); ?>;
</script>

#3

I'm not sure how necessary this is, and it adds a call to getElementById, but if you're really keen on getting inline JavaScript out of your code, you can pass it as an HTML attribute, namely:

我不确定这是多么必要，并且它添加了对getElementById的调用，但如果您真的热衷于从代码中获取内联JavaScript，则可以将其作为HTML属性传递，即：

<span class="metadata" id="metadata-size-of-widget" title="<?php echo json_encode($size_of_widget) ?>"></span>

And then in your JavaScript:

然后在你的JavaScript中：

var size_of_widget = document.getElementById("metadata-size-of-widget").title;

#1