PHP在不使用循环/ foreach的情况下检查数组对象键值

Question

只是为了学习PHP中的更多技术，我在循环foreach中经常使用它，我想找到其他方法来检查数组对象。 假设我们有类似这样的结果：

 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
        )
)

我知道我们可以做这样的事情来检查对象中的值：

$myFlag = 2;

foreach($objArr as $obj){

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

    return true;
  }

}

但是有没有一种方法可以在不使用循环的情况下进行检查？ 一种更有效的方式，因为我每次使用（大部分时间）都会感觉到这种方式，效率不是那么高，并且需要花费一些时间来处理。

Answer 1

如何将array_filter与闭包一起使用。

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

print_r($target);

结果是...

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
        )

)