Questions about PHP objects

PHP Object Issues
I wrote a class, like class MyClass,
Then I am in one of the pages such as a.php, I instantiate $obj 1=new MyClass ();
$obj1 can I use this instantiated object to be referenced by other pages? It's definitely not possible. So if I want to refer to the b.php page, do I need to instantiate it in a different format? It is not very troublesome ....
------Solution--------------------
Class MyClass writes the method of this class as a static method so that it can be used directly on each page.
such as: Myclass::func ();
------Solution--------------------
Also need to include this class file
------Solution--------------------

 
 #function. php
Class test{
private static $_instance = NULL;
Public function A () {
    Echo ' Metchod a ';
}
Public Function B () {
    Echo ' method B ';
}

    public static function instance () {
        if (self::$_instance = = = NULL) {
            Self::$_instance  = new self ();
        }
        return self::$_instance;
    }
}

#a. php
Include function.php
Echo test::instance ()->a ();

#b. php
Include function.php
Echo test::instance ()->b ();

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