# ReflectionClass::newLazyGhost

(PHP 8 >= 8.4.0)

ReflectionClass::newLazyGhost — Creates a new lazy ghost instance

### 说明

public ReflectionClass::newLazyGhost(callable `$initializer`, int `$options` = 0): object

Creates a new lazy ghost instance of the class, attaching the `initializer` to it. The constructor is not called, and properties are not set to their default value. However, the object will be automatically initialized by invoking the `initializer` the first time its state is observed or modified. See Initialization Triggers and Initialization Sequence.

### 参数

`initializer`
  The initializer is a callback with the following signature:

  initializer(object `$object`): void
  `object`
    The `object` being initialized. At this point, the object is no longer marked as lazy, and accessing it does not trigger initialization again.
  The `initializer` function must return `null` or no value.
`options`

  `options` can be a combination of the following flags:

  `ReflectionClass::SKIP_INITIALIZATION_ON_SERIALIZE`
    By default, serializing a lazy object triggers its initialization. Setting this flag prevents initialization, allowing lazy objects to be serialized without being initialized.

### 返回值

Returns a lazy ghost instance. If the object has no properties, or if all its properties are static or virtual, a normal (non-lazy) instance is returned. See also Lifecycle of Lazy Objects.

### 错误／异常

An Error if the class is internal or extends an internal class except stdClass.

### 示例

示例 #1 Basic usage

`<?php
class Example {
public function __construct(public int $prop) {
echo __METHOD__, "\n";
}
}
$reflector = new ReflectionClass(Example::class);
$object = $reflector->newLazyGhost(function (Example $object) {
$object->__construct(1);
});
var_dump($object);
var_dump($object instanceof Example);
// Triggers initialization, and fetches the property after that
var_dump($object->prop);
?>`

以上示例会输出：

    lazy ghost object(Example)#3 (0) {
      ["prop"]=>
      uninitialized(int)
    }
    bool(true)
    Example::__construct
    int(1)

### 参见

- Lazy objects
- ReflectionClass::newLazyProxy() - Creates a new lazy proxy instance
- ReflectionClass::newInstanceWithoutConstructor() - 创建新的类实例而不调用它的构造函数
- ReflectionClass::resetAsLazyGhost() - Resets an object and marks it as lazy
- ReflectionClass::markLazyObjectAsInitialized() - Marks a lazy object as initialized without calling the initializer or factory
- ReflectionClass::initializeLazyObject() - Forces initialization of a lazy object
- ReflectionClass::isUninitializedLazyObject() - Checks if an object is lazy and uninitialized
- ReflectionProperty::setRawValueWithoutLazyInitialization() - Set raw property value without triggering lazy initialization
- ReflectionProperty::skipLazyInitialization() - Marks property as non-lazy
- ReflectionProperty::isLazy() - Checks whether a property is lazy

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