Super and subclass variable inheritence

classes.php

<?php

# Our super class
class A {
	protected static $login;
        protected static $pass;

	# public static setter
        # Maybe, replaces constructor
        public static function setLogin($l,$p){
                self::$login = $l;
                self::$pass = $p;
        }
}

# Subclass 1
class A1 extends A{
        function getLogin(){ return parent::$login; }
        function getPass(){ return parent::$pass; }
}

# Subclass 2
class A2 extends A{
        function getLogin(){ return parent::$login; }
        function getPass(){ return parent::$pass; }
}
?>

testClasses.php

<?
# Include our classes
include('classes.php');

# Set defaults
A::setLogin( 'admin','qwerty' );

# Set the login
$api1 = new A1();
$api2 = new A2();

# Write output
echo 'Testing A1: '.$api1->getLogin().' - '.$api1->getPass().'<br>';
echo 'Testing A2: '.$api2->getLogin().' - '.$api2->getPass().'<br>';

?>

In this example I use login and pass, but in reality they represent any variables or object you would like to pass down to your sub classes.