PHP code for three common design patterns

　　

//Factory modeInterfaceiuser{ Public functiongetusername ();}classuserfactory{Static  Public functionLoad$className)    {        return New Strtolower($className); }    Static  Public functionCreate$className)    {        return New Strtolower($className); }}classUserImplementsiuser{ Public functionGetUserName () {return' Jack '; }}userfactory:: Create (' User '),GetUserName ();//single-case modeclasssingleton{Static  Public functiongetinstance () {Static $obj=NULL; if($obj==NULL) {            return NewSingleton (); }        return $obj; }     Public functionGetUserName () {return' Jack '; }}singleton:: getinstance ()GetUserName ();//Observer PatternInterfaceobserve{ Public functiongetusername ();}classuser{Private $servs= [];  Public functionRegister$obj)    {        Array_push($servs,$obj); return $this; }     Public functionTriggle () {if($this-Servs) {            foreach($this->servs as $key=$value) {                $value-GetUserName (); }        }    }}ClassMyUserextendsUserImplementsobserv{ Public functionGetUserName () {return' Jack '; }}(NewUser ())->register (NewMyUser)->triggle ();

PHP code for three common design patterns