Zend Framework 1.12中for循环如何合并多个对象

Question

我需要获取属于主要类别及其子类别的所有产品。 控制器部分：

$categories = new Application_Model_DbTable_Categories();

$this->view->children = $categories->fetchAll($categories->select()->where('parent_category = ?', $this->view->category->category_id));

for ($i=0; $i < count($this->view->children); $i++) {
  $this->view->products = $products->fetchAll($products->select()->where('belongs_to_category = ?', $this->view->children[$i]->category_id));
}

然后我想在视图部分显示所有 for 循环，这很容易。 上面的解决方案不能正常工作，因为在每次迭代期间，结果对象都会被新的对象覆盖。

如何在 1 个变量 ($this->view->products) 中连接这些对象？

Answer 1

阅读 PHP 手册 ;)

$data = array();

for ($i=0; $i < count($this->view->children); $i++) {
  $data = $products->fetchAll($products->select()
                   ->where('belongs_to_category = ?', $this->view->children[$i]->category_id);
  $this->view->products = array_merge($this->view->products , $data);
}

或

$data = array();
for ($i=0; $i < count($this->view->children); $i++) {
  $data[] = $this->view->children[$i]->category_id;
}
// here some error check - sizeof($data) > 0
$this->view->products = $products->fetchAll($products->select()
                                 ->where('belongs_to_category IN (?)', implode(',', $data));