<?php
    /**
     * Define MyClass
     */
    class MyClass
    {
        // Declare a public constructor
        function __construct() {}

        // Declare a public method
        public function MyPublic()
        {
        }

        // Declare a protected method
        protected function MyProtected()
        {
        }

        // Declare a private method
        private function MyPrivate()
        {
        }

        // This is public
        function Foo()
        {
            $this->MyPublic();
            $this->MyProtected();
            $this->MyPrivate();
        }
    }

    $myclass = new MyClass;
    $myclass->MyPublic(); // works
    $myclass->MyProtected(); // Fatal error
    $myclass->MyPrivate(); // Fatal error
    $myclass->Foo(); // Public, protected and private work


    /**
     * define MyClass2
     */
    class MyClass2 extends MyClass
    {
        // This is public
        function Foo2()
        {
            $this->MyPublic();
            $this->MyProtected();
            $this->MyPrivate(); // fatal error
        }
    }

    $myclass2 = new MyClass2;
    $myclass2->MyPublic(); // works
    $myclass2->Foo2(); // public and protected work, not private

    class Bar
    {
        public function test()
        {
            $this->testPrivate();
            $this->testPublic();
        }

        public function testPublic()
        {
            echo "Bar::testPublic\n";
        }

        public function testPrivate()
        {
            echo "Bar::testPrivate\n";
        }
    }

    class Foo extends Bar
    {
        public function testPublic()
        {
            echo "Foo::testPublic\n";
        }

        public function testPrivate()
        {
            echo "Foo::testPrivate\n";
        }
    }

    $myFoo = new Foo();
    $myFoo->test(); // Bar::testPrivate
                    // Foo::testPublic
?>