<?php
abstract class myAbstractClass {

    //Properties must be protected
    protected $foo;

    abstract public function __construct();

    //Private methods can't be abstract; they must be either public or protected.
    abstract public function myfunction();
}
?>

<?php
abstract class myAbstractClass {
	protected $foo; //Properties must be protected
	abstract public function __construct();
	abstract public function myfunction(); //Private methods can't be abstract; they must be either public or protected.
}
?>

<?php
abstract class myAbstractClass {
	protected $foo; //Properties must be protected
	abstract public function __construct();
	abstract public function myfunction(); //Private methods can't be abstract; they must be either public or protected.
}
?>

Abstract PHP Class Starter

PHP