php - PHP：如何遍历一个类的所有对象？

Question

我有一个代码，其中一个数组包含对象，其中包含对象，例如：

<?php
class person {
    public $name;
    public $foods=array();
}
class food {
    public $foodnames=array() ;
}
$peoplearray[$name] = new person;
$peoplearray[$name]->name = 'john' ;
$peoplearray[$name]->foods[$key] = new food;
$peoplearray[$name]->foods[$key]->foodnames[$key] = 'ice cream' ;
$peoplearray[$name]->foods[$key] = new food;
$peoplearray[$name]->foods[$key]->foodnames[$key] = 'banana' ;

$peoplearray[$name] = new person;
$peoplearray[$name]->name = 'julie' ;
$peoplearray[$name]->foods[$key] = new food;
$peoplearray[$name]->foods[$key]->foodnames[$key] = 'chocolate' ;
$peoplearray[$name]->foods[$key] = new food;
$peoplearray[$name]->foods[$key]->foodnames[$key] = 'coffee' ;
$peoplearray[$name]->foods[$key] = new food;
$peoplearray[$name]->foods[$key]->foodnames[$key] = 'rice' ;
?>

现在我也需要遍历食物类中的所有对象，以便获取它们的属性。有谁知道这样做最有效的方法？

Answer 1

在类 food 中声明一个静态属性，并在构建时将你的食物对象放入其中：

class food {
  public static $collection = array();
  // other properties ...

  public function __construct() {
    // Stuff
    self::$collection[] = $this;
  }
}

// Create foo objects
$f = new food();

// Iterate
foreach(food::$collection as $foodobj) {
  // Stuff
}