php中self关键字的功能是什么

what is the function of self keyword in php

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Possible Duplicate:
PHP: self vs. $this

这是从PHP手册，请让我知道在哪里和为什么我使用自己的关键字

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<?php
class Foo
{
public static $my_static = 'foo';

public function staticValue() {
return self::$my_static;
}
}

class Bar extends Foo
{
public function fooStatic() {
return parent::$my_static;
}
}

print Foo::$my_static ."
";

$foo = new Foo();
print $foo->staticValue() ."
";
print $foo->my_static ."
"; // Undefined"Property" my_static

print $foo::$my_static ."
";
$classname = 'Foo';
print $classname::$my_static ."
"; // As of PHP 5.3.0

print Bar::$my_static ."
";
$bar = new Bar();
print $bar->fooStatic() ."
";
?>