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