PHP对象的数组

Question

所以我一直在寻找一段时间,找不到一个简单问题的答案.PHP中是否可以有一个对象数组？如:

$ar=array();    
$ar[]=$Obj1    
$ar[]=$obj2

出于某种原因,我无法在任何地方找到答案.我认为这是可能的,但我只需要确定.

Answer 1

找到一般(以及一些简单的问题)答案的最佳位置就是阅读PHP文档.特别是在您的情况下,您可以阅读更多关于对象.您可以在数组中存储stdObject和实例化对象.实际上,有一个称为" 水合 " 的过程,它使用来自数据库行的值填充对象的成员变量,然后将对象存储在数组中(可能与其他对象一起)并返回到调用代码以进行访问.

- 编辑 -

class Car
{
    public $color;
    public $type;
}

$myCar = new Car();
$myCar->color = 'red';
$myCar->type = 'sedan';

$yourCar = new Car();
$yourCar->color = 'blue';
$yourCar->type = 'suv';

$cars = array($myCar, $yourCar);

foreach ($cars as $car) {
    echo 'This car is a ' . $car->color . ' ' . $car->type . "\n";
}

Answer 2

是.

$array[] = new stdClass;
$array[] = new stdClass;

print_r($array);

结果是:

Array
(
    [0] => stdClass Object
        (
        )

    [1] => stdClass Object
        (
        )

)

Answer 3

你可以这样做：

$posts = array(
  (object) [
    'title' => 'title 1',
    'color' => 'green'
  ],
  (object) [
    'title' => 'title 2',
    'color' => 'yellow'
   ],
   (object) [
     'title' => 'title 3',
     'color' => 'red'
   ]
);

结果：

var_dump($posts);

array(3) {
  [0]=>
  object(stdClass)#1 (2) {
    ["title"]=>
    string(7) "title 1"
    ["color"]=>
    string(5) "green"
  }
  [1]=>
  object(stdClass)#2 (2) {
    ["title"]=>
    string(7) "title 2"
    ["color"]=>
    string(6) "yellow"
  }
  [2]=>
  object(stdClass)#3 (2) {
    ["title"]=>
    string(7) "title 3"
    ["color"]=>
    string(3) "red"
  }
}

Answer 4

数组可以保存指针,所以当我想要一个对象数组时,我会这样做.

$a = array();
$o = new Whatever_Class();
$a[] = &$o;
print_r($a);

这将显示该对象是通过数组引用和访问的.

Answer 5

是的,可以在PHP中拥有对象数组.

class MyObject {
  private $property;

  public function  __construct($property) {
    $this->Property = $property;
  }
}
$ListOfObjects[] = new myObject(1); 
$ListOfObjects[] = new myObject(2); 
$ListOfObjects[] = new myObject(3); 
$ListOfObjects[] = new myObject(4); 

print "<pre>";
print_r($ListOfObjects);
print "</pre>";

Answer 6

另一个直观的解决方案可能是：

class Post
{
    public $title;
    public $date;
}

$posts = array();

$posts[0] = new Post();
$posts[0]->title = 'post sample 1';
$posts[0]->date = '1/1/2021';

$posts[1] = new Post();
$posts[1]->title = 'post sample 2';
$posts[1]->date = '2/2/2021';

foreach ($posts as $post) {
  echo 'Post Title:' . $post->title . ' Post Date:' . $post->date . "\n";
}