变量可以访问数组值吗? [英] can array values be accessed by variable variables?

问题描述

我有一个只能通过可变变量正确访问的数组，如下所示:

I have an array which I can only access correctly via variable variables, like so:

$foo['bar'] = "pie";

$fixed_name_variable = "foo['bar']";

echo $$fixed_name_variable;

在回声的pie中.除了只是不返回任何东西.因此，我需要知道这种方法是否切实可行，或者是否需要重新考虑.

Which in theroy echo's pie. Except it's just not returning anything. So I need to know if this approach is actually workable or if I need a rethink on it.

刚刚注意到.在第二行上，该栏应该用引号引起来吗?

Just noticed. On the second line, should the bar be in quotes?

推荐答案

尽管我讨厌鼓励这种行为，但是您可以使用eval在有限的范围内实现目标.

Although I hate to encourage this behaviour, you can use eval to achieve what you to a limited extent.

$foo['bar'] = "pie";
$fixed_name_variable = "foo['bar']";

$a = eval("return $$fixed_name_variable;"); 
echo $a; //outputs "pie"

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