1 <?php
 2     function test()
 3     {
 4
 5         static $nm = 1;
 6
 7         $nm = $nm * 2;
 8
 9         print $nm."<br />";
10
11     }
12
13     // 第一次执行，$nm = 2
14     test();
15     // 第一次执行，$nm = 4
16     test();
17     // 第一次执行，$nm = 8
18     test();
19 ?>

2
4
8

 1 <?php
 2     class nowamagic
 3     {
 4         public static $nm = 1;
 5
 6         function nmMethod()
 7         {
 8             self::$nm += 2;
 9             echo self::$nm . '<br />';
10         }
11     }
12
13     $nmInstance1 = new nowamagic();
14     $nmInstance1 -> nmMethod();
15
16     $nmInstance2 = new nowamagic();
17     $nmInstance2 -> nmMethod();
18 ?>

3
5

 1 <?php
 2     class NowaMagic
 3     {
 4         public static $nm = 'www.nowamagic.net';
 5
 6         public function nmMethod()
 7         {
 8             return self::$nm;
 9         }
10     }
11
12     class Article extends NowaMagic
13     {
14         public function articleMethod()
15         {
16             return parent::$nm;
17         }
18     }
19
20     // 通过作用于限定操作符访问静态变量
21     print NowaMagic::$nm . "<br />";
22
23     // 调用类的方法
24     $nowamagic = new NowaMagic();
25     print $nowamagic->nmMethod() . "<br />";
26
27     print Article::$nm . "<br />";
28
29     $nmArticle = new Article();
30     print $nmArticle->nmMethod() . "<br />";
31 ?>

1 www.nowamagic.net
2 www.nowamagic.net
3 www.nowamagic.net
4 www.nowamagic.net

 1 <?php
 2 function Demonstration()
 3 {
 4     return 'This is the result of demonstration()';
 5 }
 6
 7 class MyStaticClass
 8 {
 9     //public static $MyStaticVar = Demonstration(); //!!! FAILS: syntax error
10     public static $MyStaticVar = null;
11
12     public static function MyStaticInit()
13     {
14         //this is the static constructor
15         //because in a function, everything is allowed, including initializing using other functions
16
17         self::$MyStaticVar = Demonstration();
18     }
19 } MyStaticClass::MyStaticInit(); //Call the static constructor
20
21 echo MyStaticClass::$MyStaticVar;
22 //This is the result of demonstration()
23 ?>

1 This is the result of demonstration()