PHP在不使用循環/ foreach的情況下檢查數組對象鍵值

Question

只是為了學習PHP中的更多技術，我在循環foreach中經常使用它，我想找到其他方法來檢查數組對象。 假設我們有類似這樣的結果：

 Array
(
    [0] =; stdClass Object
        (
            [gallery_id] => 38
            [artist_id] => 58
            [title] => Appearances
            [description] => Appearances
            [photo_file] => 
            [status] => 1
            [insert_timestamp] => 2014-08-07 03:27:23
            [update_timestamp] => 2014-08-07 15:26:24
            [url] => talents/58/photos/38/Appearances
            [position] => 
        )

    [1] => stdClass Object
        (
            [gallery_id] => 36
            [artist_id] => 58
            [title] => Endorsements
            [description] => Endorsements
            [photo_file] => 
            [status] => 1
            [insert_timestamp] => 2014-08-07 03:17:28
            [update_timestamp] => 2015-01-13 15:50:09
            [url] => talents/58/photos/36/Endorsements
            [position] => 1
        )

    [2] => stdClass Object
        (
            [gallery_id] => 34
            [artist_id] => 58
            [title] => Magazine Covers
            [description] => Magazine Covers
            [photo_file] => 
            [status] => 1
            [insert_timestamp] => 2014-08-07 02:54:27
            [update_timestamp] => 2015-01-13 15:50:10
            [url] => talents/58/photos/34/Magazine-Covers
            [position] => 2
        )
)

我知道我們可以做這樣的事情來檢查對象中的值：

$myFlag = 2;

foreach($objArr as $obj){

  if($obj->position == $myFlag){

    return true;
  }

}

但是有沒有一種方法可以在不使用循環的情況下進行檢查？ 一種更有效的方式，因為我每次使用（大部分時間）都會感覺到這種方式，效率不是那么高，並且需要花費一些時間來處理。

Answer 1

如何將array_filter與閉包一起使用。

$myFlag = 2;
$target = array_filter($objArr, function($elem) use($myFlag){
        return $elem->position === $myFlag;
    });

print_r($target);

結果是...

Array
(
    [2] => stdClass Object
        (
            [gallery_id] => 34
            [artist_id] => 58
            [title] => Magazine Covers
            [description] => Magazine Covers
            [photo_file] =>
            [status] => 1
            [insert_timestamp] => 2014-08-07 02:54:27
            [update_timestamp] => 2015-01-13 15:50:10
            [url] => talents/58/photos/34/magazine-covers
            [position] => 2
        )

)