你可以使用 get_defined_vars() 来查找与您要查找的名称具有相同值的变量的名称.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() 似乎无法正常工作，它返回 'var' 因为在函数本身中使用了 $var.$GLOBALS 似乎可以工作，所以我将其更改为.

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你想做的事情.

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.