如何从函数中获取返回的关联数组元素？

public function getPhotos($id_album){
$hisPhoto = '123';
$myPhoto = '456';
$herPhoto = '789';
$id_user = 1;
$photoTable = array
(
    'hisPhoto' => $hisPhoto,
    'myPhoto' => $myPhoto,
    'herPhoto' => $herPhoto,
);

return array
(
    'id_user' => $id_user,
    'photos' => $photoTable
)
}

$photos = getPhotos($id_album);

I have no idea how to use associative array in associative array. What is the simplest way using this function to get to the my photo (value '456')?

$photos will end up having the structure:

Array
(

'id_user' => $id_user,

'photos' => 
          Array
              (
                'hisPhoto' => $hisPhoto,
                'myPhoto' => $myPhoto,
                'herPhoto' => $herPhoto
              )
)

So you can just go:

echo $photos['photos']['myPhoto'];

If you are stuck with the structure of an array you can use:

print_r($array);

To view the structure