PHP design mode single-instance pattern code, PHP design mode _php Tutorial

PHP design mode single-instance pattern code, PHP design mode

PHP design pattern of a single example model for your reference, the specific content as follows

<?php/** * PHP design mode singleton mode */class fruit{private static $instanceMap = Array (); Protected getter for singleton instances protected static function Getsingleton ($className) {//Guaranteed singleton mode and cannot be from the controller instance        and Clone if (!isset (self:: $instanceMap [$className])) {$object = new $className; Make sure this object inherit from Singleton if ($object instanceof Fruit) {self:: $instanceMap [$classNa          Me] = $object;        Var_dump ($object);        } else {throw singletonexception ("Class ' $className ' do not inherit from singleton!");    }} return Self:: $instanceMap [$className]; }//protected constructor to prevent outside instantiation protected function __construct () {}//denie cloning of Singleton objects Public final function __clone () {trigger_error (' It's impossible to clone Singleton ', E_user_err    OR);    }} class Apple extends fruit{protected $rndId; Public Function __construct () {$thisRndid = rand (); } public Function Whatami () {echo ' I am a Apple ('. $this->rndid. ')
';      } public static function getinstance () {//echo get_class ();    Return Fruit::getsingleton (Get_class ()); }} class Greenapple extends apple{public Function Whatami () {echo ' I am a greenapple ('. $this->rndid. ')
';    } public static function getinstance () {return Fruit::getsingleton (Get_class ());  }} $apple 1 = apple::getinstance ();  Var_dump ($apple 1);  $apple 2 = greenapple::getinstance (); $apple 1->whatami ()//should echo ' I am a Apple (some number) $apple 2->whatami ();//should Echo ' I am a greenapple (s  ome number) $apple 1 = apple::getinstance ();  $apple 2 = greenapple::getinstance (); Guaranteed Singleton mode $apple 1->whatami ();//should Echo ' I am a Apple (same number as above) $apple 2->whatami ();//should Echo ' I am a greenapple (same number as above)//$a = Clone $apple 1;//This should fail//$b = Clone $apple 2;//this should F Ail

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