在多维数组中查找值

Question

I've a multidimensional array:

array (
    array (
        "username"        => "foo",
        "favoriteGame"    => "Mario"
    )
    array (
        "username"        => "bar",
        "favoriteGame"    => "Mario"
    )
    array (
        "username"        => "xyz",
        "favoriteGame"    => "Zelda"
    )
)

How could I get the usernames of the persons that like to play for example Mario the easiest way possible?

EDIT: My fault: forget to explicitly mention that the "favoriteGame" value is dynamic and I cannot know which it is in advance.

My Solution:

foreach($users as $key => $value)
{
    if(!isset($$value['favoriteGame']))
    {
        $$value['favoriteGame'] = array();
    }
    array_push($$value['favoriteGame'], $value['username']);
}

Iterate over each sub-array and find its favoriteGame value. If there is not already an array $favoriteGame create it. Push the username-value of the actual sub-array to the $favoriteGame array.

Thanks for your replies, I just couldn't phrase this question properly.

Answer 1

I would use array_filter. If you have PHP 5.3 or up, you can do it like this:

$favorite = "Mario";
$filter = function($player) use($favorite) { return $player['favoriteGame'] == $favorite; };
$filtered = array_filter($players, $filter);

It will be a little different for older versions because you won't be able to use lambda functions.