PHP design pattern of single case pattern code _php technique

The example of a single example of the PHP design pattern, for your reference, the details are as follows

<?php/** * PHP design mode single case mode/class fruit{private static $instanceMap = Array (); Protected getter for singleton instances protected static function Getsingleton ($className) {//Guaranteed single case mode and not from controller
        Instantiate and Clone if (!isset (self:: $instanceMap [$className])) {$object = new $className; Make sure this object inherit from Singleton if ($object instanceof Fruit) {self:: $instanceMap [$class
          Name] = $object;
        Var_dump ($object);
        else {throw singletonexception ("Class ' $className ' does not inherit from singleton!");
    } return Self:: $instanceMap [$className]; }//protected constructor to prevent outside instantiation protected function __construct () {}//denie Clonin G of Singleton objects public final function __clone () {trigger_error (' It's impossible to clone Singleton ', E_u
    SER_ERROR);

    Class Apple extends fruit{protected $rndId; Public funCtion __construct () {$this->rndid = rand (); The Public Function Whatami () {echo ' I am-A-Apple ('. $this->rndid.
    ') <br/> ';
      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 .
    ') <br/> ';
    The 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 (
  Some number) $apple 1 = apple::getinstance ();
  $apple 2 = greenapple::getinstance ();  Guaranteed single case 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 fail
 

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