PHP静态与实例 [英] PHP Static vs Instance
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问题描述
我正要编写一种方法,将一些计费数据转换为发票.
I am just about to write a method to convert some billing data into an invoice.
假设我有一个对象数组,其中包含创建Invocie项所需的数据.
So say i have and an array of objects that contain the data necessary to create the invocie items.
在计费控制器中,以下哪种方法是正确的
While in the billing controller Which of the following way is correct
$invoice = new Invoice();
$invoice->createInvoiceFromBilling($billingItems);
然后在发票类别中
Public Function createInvoiceFromBilling($billingItems)
{
$this->data = $billingItems;
OR
Invoice::createInvoiceFromBilling($billingItems)
然后在发票类别中
Public Function createInvoiceFromBilling($billingItems)
{
$invoice = new Invoice();
$invoice->data = $billingItems;
哪种方法是正确的?
致谢
推荐答案
As tereško pointed out in the comments section above, you should look into using the Factory pattern. A good (and simple) real-world-based example from the linked source:
<?php
class Automobile
{
private $vehicle_make;
private $vehicle_model;
public function __construct($make, $model)
{
$this->vehicle_make = $make;
$this->vehicle_model = $model;
}
public function get_make_and_model()
{
return $this->vehicle_make . ' ' . $this->vehicle_model;
}
}
class AutomobileFactory
{
public function create($make, $model)
{
return new Automobile($make, $model);
}
}
// have the factory create the Automobile object
$automobileFactory = new AutomobileFactory();
$veyron = $automobileFactory->create('Bugatti', 'Veyron');
print_r($veyron->get_make_and_model()); // outputs "Bugatti Veyron"
如您所见,实际上是AutomobileFactory创建了Automobile的实例.
As you can see, it is AutomobileFactory that actually creates instances of Automobile.
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