php - 如果你知道 array[x]->ID，找出 array[x] 的对象 id？

Question

假设我们有这个数组，例如来自预览问题...如果我们知道该对象的 [id] 是，我如何找到 [X]=> stdClass 对象 [id] => 9???

Array
(
    [0] => stdClass Object
        (
            [id] => 8
            [book_category] => C Program
            [book_id] => 2
            [book_name] => C Language
            [book_category_id] => 8
            [book_in_stock] => 5
        )

    [1] => stdClass Object
        (
            [id] => 8
            [book_category] => C Program
            [book_id] => 1
            [book_name] => C++
            [book_category_id] => 8
            [book_in_stock] => 10
        )

    [X] => stdClass Object
        (
            **[id] => 9**
            [book_category] => English
            [book_id] => 3
            [book_name] => Comp Eng
            [book_category_id] => 9
            [book_in_stock] => 5
        )

    [3] => stdClass Object
        (
            [id] => 9
            [book_category] => English
            [book_id] => 4
            [book_name] => Eng English
            [book_category_id] => 9
            [book_in_stock] => 5
        )

)

Answer 1

或者使用array_filter :

$result=array_filter($array, function($x) {
    return $x->id == 9;
});

将返回 id 为 9 的所有对象。如果 id 是唯一的，您可以使用 $result[0] 访问该对象。