php 如何在创建对象时为 stdClass 对象设置属性
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How to set attributes for stdClass object at the time object creation
提问by Habeeb Perwad
I want to set attribute for a stdClassobject in a single statement. I don't have any idea about it. I know the following things
我想在单个语句中为stdClass对象设置属性。我对此一无所知。我知道以下几点
$obj = new stdClass;
$obj->attr = 'loremipsum';
It takes two statements.
它需要两个语句。
$obj = (object) array('attr'=>'loremipsum');
It takes single statement but it is not direct method.
它需要单个语句，但不是直接方法。
$obj = new stdClass(array('attr'=>'loremipsum'));
It is not working.
它不工作。
回答by Ja?ck
$obj = (object) array(
'attr'=>'loremipsum'
);
Actually, that's as direct as it's going to get. Even a custom constructor won't be able to do this in a single expression.
实际上，这很直接。即使是自定义构造函数也无法在单个表达式中执行此操作。
The (object)cast mightactually be a simple translation from an array, because internally the properties are stored in a hash as well.
该(object)投可能实际上是从一个数组简单的翻译，因为内部的属性存储在一个哈希为好。
You could create a base class like this:
你可以像这样创建一个基类：
abstract class MyObject
{
public function __construct(array $attributes = array())
{
foreach ($attributes as $name => $value) {
$this->{$name} = $value;
}
}
}
class MyWhatever extends MyObject
{
}
$x = new MyWhatever(array(
'attr' => 'loremipsum',
));
Doing so will lock up your constructor though, requiring each class to call its parent constructor when overridden.
这样做会锁定你的构造函数，要求每个类在被覆盖时调用它的父构造函数。
回答by dotancohen
Though Ja?ck gives a good answer, it is important to stress that the PHP interpreter itself has a method for describing how to properly represent an object or variable:
尽管 Hyman 给出了一个很好的答案，但重要的是要强调 PHP 解释器本身有一种方法来描述如何正确表示对象或变量：
php > $someObject = new stdClass();
php > $someObject->name = 'Ethan';
php > var_export($someObject);
stdClass::__set_state(array(
'name' => 'Ethan',
))
Interestingly, using stdClass::__set_statefails to create a stdClass object, thus displaying it as such is likely a bug in var_export(). However, it does illustrate that there is no straightforward method to create the stdClass object with attributes set at the time of object creation.
有趣的是，使用stdClass::__set_state无法创建stdClass的对象，从而显示它是这样很可能中的一个错误var_export()。但是，它确实说明没有直接的方法来创建具有在对象创建时设置的属性的 stdClass 对象。
回答by Hydtek
foreach ($attributes as $name => $value) {
if (property_exists(self::class, $name)) {
$this->{$name} = $value;
}
}
is cleanest because it will set an arbitrary attribute if you print_r(get_object_vars($obj)) of returned object if attribute does not exist.
是最干净的，因为如果属性不存在，它会在返回对象的 print_r(get_object_vars($obj)) 中设置任意属性。
