Get all extended Classes in PHP

问题

Say I got a class like:

<?
class ObjectModel {
}

and I got some other classes like:

<?
class SomeNewClass extends ObjectModel {
}

class SomeOtherNewClass extends ObjectModel {
}

Is there a way to get the children (SomeNewClass & SomeOtherNewClass) based on the ObjectModel class?

回答1:

class ObjectModel {
}

class SomeNewClass extends ObjectModel {
}

class SomeOtherNewClass extends ObjectModel {
}

class SomeOtherNewClassLol extends ObjectModel {
}

function get_extends_number($base){
    $rt=0;
  foreach(get_declared_classes() as $class)
        if(is_subclass_of($class,$base)) $rt++;
        return $rt;
}

echo get_extends_number('ObjectModel'); //output: 3

Yes, you can do it, DEMO

回答2:

You can iterate all classes returned by get_declared_classes() and inspecting their Reflection (Reflection::isSubclassOf)

But - this won't work when you are using autoloading.

回答3:

Not sure if this is going to get downvoted but you can hack your way through:

1. get_declared_classes
2. get_parent_class for each class on 1

It's not pretty, but if the child classes are loaded, it's possible.

来源：https://stackoverflow.com/questions/16680040/get-all-extended-classes-in-php