Calling a non static function in a static child class php

Question

I have a singleton class that extends a normal class. (Class1)

The normal class has two non-static functions called set() and get(). (Class2)

A third class (Class3) which gets the singleton's (Class1's) instance uses the set() and get() through the singleton. It works fine using Class3, but is there any way to use the get() method inside the singleton from the parent class to see what the "third" class set it to?

I can't seem to call the get because it's non static. Please let me know if this is confusing.

class Class1 { public function doThings(){ $this->view->set("css","1234"); } } class Singleton extends Class3 { static public function instance() { if (!self::$_instance instanceof self) { self::$_instance = new self(); } return self::$_instance; } //I want this singleton to call get("css") and have it return the value. } class Class3{ public function get(arg){//implementation } public function set(arg){//implementation } }

You asked us to let you know if this is confusing. It's confusing. — Marvo
– Marvo, Commented Feb 15, 2012 at 23:07
What do you need the normal class for and why extend it with a singleton pattern? — busypeoples
– busypeoples, Commented Feb 15, 2012 at 23:10
the normal class is a templating class and i want to extend it to use it's many useful functions through my singleton. — volk
– volk, Commented Feb 15, 2012 at 23:12

Mike Purcell · Accepted Answer · 2012-02-15 23:25:21Z

I've never seen specific class just for a singleton which extends the class it is supposed to be a singleton for. Instead, try this:

class Class3 { private $_instance; static public function instance() { if (!self::$_instance instanceof self) { self::$_instance = new self(); } return self::$_instance; } public function get(arg){//implementation } public function set(arg){//implementation } } // Calling code // I want this singleton to call get("css") and have it return the value. Class3::getInstance()->set('css', 'border:0'); Class3::getInstance()->get('css');

this is pretty good, the only problem is that there are a lot more functions than just get and set and I can't just implement them all in the singleton thus the extending.
Your not "implementing them all in the singleton", the singleton represents a single instance of class3, which means that it has access to EVERY public member variable and function it would as if it extended class3.
oh wait, i take back what i've said. I didn't notice that your solution was class3 and not the singleton.

volk · Accepted Answer · 2012-02-16 15:07:22Z

0

I just solved my own question, sorry for the late reply.

All I had to do in the singleton was call get() this way:

self::instance()->get("css");

answered Feb 16, 2012 at 15:07

volk

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4 Comments

Mike Purcell Over a year ago

Be careful, you will end up with namespace collisions if you opt to do the same thing for another class.

Mike Purcell Over a year ago

What if you wanted to do the same thing for class2? You will now have two classes named Singleton, which will cause errors due to namespace collision. I'd recommend going with my solution, so that you avoid this issue in the future.

volk Over a year ago

thanks, that makes sense. although it will never be used this way

Mike Purcell Over a year ago

No worries, just making you aware of possible future issues. Good luck.

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