如何“调用” PHP中的类实例？ [英] How to "invoke" a class instance in PHP?

问题描述

有可能通过字符串表示调用类实例吗？

is there any possibility to "invoke" a class instance by a string representation?

在这种情况下，我希望代码看起来像这样：

In this case i would expect code to look like this:

class MyClass {
  public $attribute;
}

$obj = getInstanceOf( "MyClass"); //$obj is now an instance of MyClass
$obj->attribute = "Hello World";

我认为这是可能的，因为PHP的SoapClient接受一个classMappings的列表， WSDL元素到PHP类。但是如何SoapClient调用类实例？

I think this must be possible, as PHP's SoapClient accepts a list of classMappings which is used to map a WSDL element to a PHP Class. But how is the SoapClient "invoking" the class instances?

推荐答案

$class = 'MyClass';
$instance = new $class;

但是，如果你的类的构造函数接受可变数量的参数，数组（ call_user_func_array ），您必须使用反射：

However, if your class' constructor accepts a variable number of arguments, and you hold those arguments in an array (sort of call_user_func_array), you have to use reflection:

$class = new ReflectionClass('MyClass');
$args  = array('foo', 'bar');
$instance = $class->newInstanceArgs($args);

还有 ReflectionClass :: newInstance 但它的作用与上述第一个选项相同。

There is also ReflectionClass::newInstance, but it does the same thing as the first option above.

参考：

• 对象实例化


• ReflectionClass :: newInstanceArgs（）


• ReflectionClass :: newInstance（ ）

• Object instantiation
• ReflectionClass::newInstanceArgs()
• ReflectionClass::newInstance()

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