如何将具有特定属性的项目移到PHP数组的顶部

Question

I have an associative array that looks like so:

   {
      "album_6":{
        "name":"02-04-2014",
        "id":6,
        "count":"2",
        "cover":"26974771533c4b57cb0aa"
      },
      "album_3":{
        "name":"Photos of you",
        "id":3,
        "count":"4",
        "cover":"8872935615302242c4fa6c",
        "of_you":true
      }
    }

Thy array can contain many items but one of the items will have the extra property of_you .

In the above example it is album_3

I would like to move the item that has the of_you property to the first position in the array. How can I achieve this?

I have tried using usort with a comparison function but it doesn't seem to work.

Note: The item could be at any numerical index.

ANSWER:

I found the answer literally straight after posting this question. The solution is as follows:

  uasort($albums, function($a, $b) {
      return (empty($a['of_you'])) ? 1 : -1;
  });

If anyone has a faster/more efficient method. Please post it as an answer and I will accept.

EDIT: in order to mantain the associative keys asort() is a better choice in this instance

Answer 1

Even if it didn't work for you, usort is the way:

usort($array, function($a, $b) {
    $hasA = array_key_exists('of_you', $a);
    $hasB = array_key_exists('of_you', $b);

    if ($hasA and $hasB) {
        return 0;
    }

    return $hasA ? -1 : 1;
});

Keep in mind, it will not do more sort than first the elements with the key of_you and then the rest.