调用函数时，php extract（）关联数组

Question

I have this function:

function extractAvailable($assoc1, $assoc2){
    if($assoc1) extract($assoc1);
    else extract($assoc2);
}

What I expect is to call this function later in the global scope, and have my variables available, like so:

$arr1 = [];
$arr2 = ['one'=>1, 'two'=>'SecondItem'];
extractAvailable($arr1, $arr2);

With the call on extractAvailable(), I need to have the varialbes $one and $two available in the current scope. Obviously, I've got something wrongly figured concerning variable scope use here, 'cause it isn't working. When I try to use the variable, what I get instead is Notice: Undefined variable: one.

How do I get this to work?

Answer 1

If you want them to be available in the global scope, you can use variable variables instead of extract, and specify them as global.

function extractAvailable($assoc1, $assoc2){
    if($assoc1) {
        foreach ($assoc1 as $key => $value) {
            global $$key;
            $$key = $value;            
        }
    } else {
        foreach ($assoc2 as $key => $value) {
            global $$key;
            $$key = $value;            
        }
    }
}