PHPDoc如何声明一个声明性数组？

Question

How i can create a PHPDoc block for an declarative array?.

For example, let's say that i have the next function:

/**
* @return ??????????
*/
function dummy() {
   $x1=array("key1"=>"hello","ke2"=>"world");
  return $x1;
}
// ... later
$x1=dummy();
echo $x1["key1"]; 

I want to be explicit in the array result, instead of use @return array.

(i also tried) I also know that i can return an array of object with @return Class[] but in this case, im not using classes.

Thanks.