PHP get_object_vars 不起作用

Question

函数应该返回数组

public static function categories() {
    // return array of categories
    $categories = Category::select('category')->get();
    return get_object_vars($categories);
}

但是，当我转储 categories()我收到 array(0) { }
分类表

+----+----------------------+
| id |       category       |
+----+----------------------+
| 1  | Appliances           |
| 2  | Auto Parts           |
| 3  | Boats & Watercraft's |
| 4  | Campers              |
+----+----------------------+

当我回来时 $categories我有一个更长的版本

object(Illuminate\Database\Eloquent\Collection)#272 (1) { ["items":protected]=> array(20) { [0]=> object(Category)#289 (20) { ["table":protected]=> string(10) "categories" ["connection":protected]=> NULL ["primaryKey":protected]=> string(2) "id" ["perPage":protected]=> int(15) ["incrementing"]=> bool(true) ["timestamps"]=> bool(true) ["attributes":protected]=> array(1) { ["category"]=> string(10) "Appliances" } ["original":protected]=> array(1) { ["category"]=> string(10) "Appliances" } ["relations":protected]=> array(0) { } ["hidden":protected]=> array(0) { } ["visible":protected]=> array(0) { } ["appends":protected]=> array(0) { } ["fillable":protected]=> array(0) { } ["guarded":protected]=> array(1) { [0]=> string(1) "*" } ["dates":protected]=> array(0) { } ["touches":protected]=> array(0) { } ["observables":protected]=> array(0) { } ["with":protected]=> array(0) { } ["morphClass":protected]=> NULL ["exists"]=> bool(true) } [1]=> object(Category)#288 (20) { ["table":protected]=> string(10) "categories" ["connection":protected]=> NULL ["primaryKey":protected]=> string(2) "id" ["perPage":protected]=> int(15) ["incrementing"]=> bool(true) ["timestamps"]=> bool(true) ["attributes":protected]=> array(1) { ["category"]=> string(10) "Auto Parts" } ["original":protected]=> array(1) { ["category"]=> string(10) "Auto Parts" } ["relations":protected]=> array(0) { } ["hidden":protected]=> array(0) { } ["visible":protected]=> array(0) { } ["appends":protected]=> array(0) { } ["fillable":protected]=> array(0) { } ["guarded":protected]=> array(1) { [0]=> string(1) "*" } ["dates":protected]=> array(0) { } ["touches":protected]=> array(0) { } ["observables":protected]=> array(0) { } ["with":protected]=> array(0) { } ["morphClass":protected]=> NULL ["exists"]=> bool(true) } [2]=> object(Category)#271 (20) { ["table":protected]=> 

Answer 1

get_object_vars无法正常工作，因为它只能找到实际(和可访问)的属性。一个 Collection (这是 $categories 是什么)没有可以读取的属性。您可能想做的是 lists()

$categories = Category::lists('category');
return $categories;