Shorter way to instantiation PHP class

Question

Say I have a class Core() where it will give me the instance of different classes depending on some initialization. Say that after initiating it, I get some class and then want to instantiate that. This is what I do:

$core = new Core(); // $core is further initiated $api = $core->getClass(); // This returns, for instance class Library_MyClass $class = new $api();

Is there a way to combine the last two steps into one? So for instance I say something like $class = new $core->getClass()()? Obviously what I wrote is wrong, but that is sort of what I want! Is that possible?

Normally you wouldn't have a class inside a class. You should have them separated I would think. — evan.stoddard
– evan.stoddard, Commented Aug 31, 2013 at 2:07

PeeHaa · Accepted Answer · 2013-08-31 02:12:51Z

1

If this is some form of a factory you could do something like:

class Core { public function getClass() { return new Library_MyClass(); } } $core = new Core(); $class = $core->getClass();

However considering the name of the class Core I suspect you may be violating some SOLID principles here.

answered Aug 31, 2013 at 2:12

PeeHaa

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3 Comments

Starx Over a year ago

Yeah, it should be something like getLibraryInstance().

Kousha Over a year ago

The name Core was an example. I have a different name. The problem with your solution is that I would want to give the class some initialization, i.e. new $class($param1, ...) and since depending on what class I get, I may or may not pass parameter(s), I rather that my Core only returns the class name and I instantiate it myself later.

Jason Over a year ago

The SOLID principles sound like something out of a motivational poster that they would have in Microsoft HQ. Experimenting with what you can do is half the fun (actually, more) in programming. Open-source especially :) new tricks -> new features later. Besides, I think I have an idea of what the poster wants to do, possibly make a catch all for loading php class files.

Th. Ma. · Accepted Answer · 2013-08-31 17:07:43Z

You might want to benefit from the use of dependency injection (considering a slight update applied to PeeHaa example)

class Core { public function getClass($api) { return new $api(); } } $core = new Core(); $apiInstance = $core->getClass('Library_MyClass');

This way you won't have to update the Core class whenever you would like it to provide you with an instance of another library class.

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