PHP Singleton Pattern Code snippet

1<?PHP2 3 error_reporting(E_all|e_strict);4 5 classsingle{6 7      Public $hash;8 9     Static protected $ins=NULL;Ten  One     Final protected function__construct () {//final can be inherited and cannot be overridden (prevents subclasses from overriding the constructor method) A         $this->hash =Mt_rand(1,9999); -     } -  the     Static  Public functiongetinstance () { -         if(Self::$insInstanceof self) {//instanceof Determine if an object is an instance of a class -             returnSelf::$ins; -         } +Self::$ins=NewSelf (); -         returnSelf::$ins;  +     } A } at  - $s 1= Single::getinstance (); - $s 2= Single::getinstance (); -  - Var_dump($s 1); - Var_dump($s 2); in  - //son class inherits single class to classSonextendssingle{ + } -  the $s 1= Son::getinstance (); * $s 2= Son::getinstance (); $ Panax Notoginseng Var_dump($s 1); - Var_dump($s 2);

Page output

Object (single) [1]    Public ' hash ' = = int 9762object(Single) [1  ]public ' hash ' = int 9762object( Single) [1]  public ' hash ' = = int 9762object(Single) [1]     Public ' hash ' = int 9762

PHP Singleton Pattern Code snippet