Using $this from within a function

I have a document that is able to use 开发者_运维知识库$this to access certain bits of info. Inside that document there is a function which cannot access $this (gives an error about not being inside an object).

Is there any way to allow it access to $this, so I can run the class's methods from within the function?

I have tried using globals but to no avail.

If the function is defined outside the class, you can pass in an instance of the object and use that.

For example:

class A
{
    public function B()
    {
        echo "C";
    }
}

function D($obj)
{
    echo $obj->B();
}

Rewrite the function so that it expects an additional parameter. Pass $this as argument to that function

Assuming that the function is part of the class that you are trying to get a property of use self where you would have used this.