如何在PHP中将变量名作为字符串获取? [英] How to get a variable name as a string in PHP?

问题描述

假设我有这个 PHP 代码:

Say i have this PHP code:

$FooBar = "a string";

然后我需要一个这样的函数:

i then need a function like this:

print_var_name($FooBar);

打印:

FooBar

任何想法如何实现这一目标?这甚至可能在 PHP 中实现吗?

Any Ideas how to achieve this? Is this even possible in PHP?

推荐答案

您可以使用 get_defined_vars() 来查找与您要查找名称的变量具有相同值的变量名称.显然这并不总是有效，因为不同的变量通常具有相同的值，但这是我能想到的唯一方法.

You could use get_defined_vars() to find the name of a variable that has the same value as the one you're trying to find the name of. Obviously this will not always work, since different variables often have the same values, but it's the only way I can think of to do this.

get_defined_vars() 似乎没有正常工作，它返回var"，因为 $var 用于函数本身.$GLOBALS 似乎有效，所以我已将其更改为那个.

get_defined_vars() doesn't seem to be working correctly, it returns 'var' because $var is used in the function itself. $GLOBALS seems to work so I've changed it to that.

function print_var_name($var) {
    foreach($GLOBALS as $var_name => $value) {
        if ($value === $var) {
            return $var_name;
        }
    }

    return false;
}

需要明确的是，在 PHP 中没有这样做的好方法，这可能是因为您不应该这样做.可能有更好的方法来做您想做的事情.

to be clear, there is no good way to do this in PHP, which is probably because you shouldn't have to do it. There are probably better ways of doing what you're trying to do.

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