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PHP修饰符:global和static

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Release: 2016-06-21 08:53:13
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function testGloabl(){
        global $testGloabl;
        $testGloabl = 2;
        $testGloabl ++;
     }
     testGloabl();
     echo $testGloabl."".$GLOBALS['testGloabl'];
   
     function testStatic(){
        static $testStatic = 2;
        $testStatic ++;
     }

    testStatic();
    echo $testStatic;//使用static关键字的变量,在函数外部访问将会提示 $testStatic未定义;

说明:
1.使用global定义的关键字,当这个关键字所在函数被调用后,它将在当前脚本的任何位置可以被访问到
2.使用static定位的关键字,当这个关键字所在函数内被访问,该函数外其他地方无法访问到。
共同点:global  static 都可以使定位的变量指向同一块内存区域。



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