Using $this - but not working

[Anti-Moronic]

I *think* this has something to do with the way I've started using classes.

 

I used to do this:

 

$class = classname();

$class->classfunction();

 

but now I simply do this:

 

classname::classfunction

 

Yet now when I use $this within 'classname' it says:

 

"Using $this when not in object context"

 

If that is the problem, is there any other way to use 'this' with this method or will I have to create the object first?

 

Appreciate any help.

[Buddski]

Using :: is used for static functions..

You can only use $this in the case of your first example..

 

[phonydream]

You'll have to create the object first.

 

Unless you are within the class itself, in which case you can use class::classfunction

[Buddski]

Should have read the whole question

If you dont want to create the object you can use self::function_name(); inside the class instead of $this

[Anti-Moronic]

..thanks! I tend to use classname::classfunction(); quite a lot now when outside classes instead of creating an object at the top of my scripts.

 

Does this have any performance impact?

 

classname::classfunction1();

.....

classname::classfunction2();

 

OR

 

$classname = classname();

$classname->classfunction1();

....

$classname->classfunction2();

 

Thanks again, appreciate the help.

[Buddski]

I dont know, exactly, but if i was to have a guess.. classname::classfunction(), i would assume uses less memory because you dont have to create an object to access its function.. I could be wrong

[Daniel0]

Calling static methods is faster than using objects. If all you're doing is calling static methods on objects (of if you do it interchangeably) there is no point in using classes in the first place.

[Anti-Moronic]

Thanks Daniel! ..and good point. I don't think I've come up against anything which requires me to use classes in such a way and I must admit, I am a bit out of my depth when it comes to OOP. I guess I use classes to arrange my functions then