PHP Object Single-state (singleton, single-piece) design mode static

<?phpheader (' Content-type:text/html;charset=utf-8 ');/* * single-state design mode   Singleton    single-piece  * a class can only create one object   *1. If you want a class to have only one object, first let the class fail to create the object and construct the method private *2. You can use a static method inside the class to create the object  */     class persion{        //using static members for single-state design          static  $obj  = null;         private function __construct () {                     }         static function getobj () {             //If there is no object at the first call, create, and later invoke, directly use the object created for the first time              if (Is_null (self:: $obj))             self::$ obj = new self;//sElf on behalf of the class name itself             return self:: $obj;         }        function  say () {            echo  ' I am Chinese ';         }                 function __destruct () {             echo  ' Destruction method release Resources <br/> ';         }     }     $p  = persion::getobj ();     $p  = persion::getobj ();     $p  ->say ();

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PHP Object Single-state (singleton, single-piece) design mode static