PHP 通过 class 作为参考？

Question

in Python, you could do something like this:

class SomeClass(object): pass
s = SomeClass
someClassInstance = s()

How could you accomplish the same effect in PHP? From what I understand, you cannot do this? Is this true?

Answer 1

You can create instances of dynamic class names; simply pass the name of the class as a string:

class SomeClass {}
$s = 'SomeClass';
$someClassInstance = new $s();

Answer 2

Using reflection:

class SomeClass {}
$s = new ReflectionClass('SomeClass');
$someClassInstance = $s->newInstance();

The nice thing about using reflection is that it throws a catchable exception in the event the class does not exist.