class constructor

Question

I am trying to understand how classes and functions work more. So i have written a class with 2 functions inside it. Then initiated the class with

$fifaadmin = new FifaAdmin;

When I try to call this class from another page i get the following error

Call to a member function leagueToReplace() on a non-object

What am i doing wrong? Is there an obvious answer? Thanks

Answer 1

You need to instantiate the class on each page. Each script is executed independently.

Answer 2

Sounds like $fifaadmin didn't instantiate the object correctly.

What does this say?

var_dump($fifaadmin instanceof FifaAdmin);

It should return true if it is set up correctly. Try it just before you call a method on it.

When you say another page, do you mean from a PHP include or a new URL (and therefore request)?

You will need to instantiate it on every request, as HTTP is stateless.

Answer 3

Depending on what your code does, you might want to use static methods:

// common.php
class Common {
    public static function calculate($x, $y) {
        return $x + $y;
    }
}

// another PHP file: (you still need to include common.php
// you won't need to instantiate the class

echo Common::calculate(10, 20);

Answer 4

If you want to use an instance of class in different pages, you need to serialize it and save it somewhere (session is ok) and de-serialize it when you want use it.

More detail about serialize in PHP here http://php.net/manual/en/function.serialize.php