学步园

<?php<br /> class Foo<br /> {<br /> public static $my_static = '静1';<br /> public function staticValue() {<br /> return self::$my_static;<br /> }<br /> }<br /> class Bar extends Foo<br /> {<br /> public static $my_static = '静2';<br /> public function fooStatic() {<br /> return parent::$my_static;<br /> }<br /> }</p> <p>print Foo::$my_static . "<br />";//1<br /> $foo = new Foo();<br /> print $foo->staticValue() . "<br />";//2<br /> //print $foo->my_static . "<br />"; // Undefined "Property" my_static<br /> print $foo::$my_static . "<br />";//3<br /> $classname = 'Foo';<br /> print $classname::$my_static . "<br />"; // PHP 5.3.0之后可以动态调用3<br /> print Bar::$my_static . "<br />";//4<br /> $bar = new Bar();<br /> print $bar->fooStatic() . "<br />";//5<br /> ?>