Review PHP design mode--Registration mode

Registration mode:

1 classdbconnections{2     var $_store=Array();3      Public functionIsValid ($key) {4         return isset($this->_store[$key]);5     }6 7      Public function&get ($key){8         if(isset($this->_store[$key])) 9             return $this->_store[$key];Ten     } One  A      Public functionSet$key, &$obj) { -         $this->_store[$key] = &$obj; -     } the  -      Public function&getinstance () { -         Static $instance=Array(); -         if(!$instance) +             $instance[0] = &Newdbconnections; -         return $instance[0]; +     } A } at  - classmysqlconnection{ -      Public $name=false; -      Public function__construct ($db){ -         $this->name =$db; -         Echo $db, "\ n"; in     } -  to      Public functionAppend$str){ +         $this->name. = "".$str; -     } the } *  $ //initial setup, somewhere near the start of your scriptPanax Notoginseng $dbc= & Dbconnections::getinstance (); - $dbc->set (' Server1 ',NewMysqlconnection (' DB1 ')); the $dbc->set (' Server2 ',NewMysqlconnection (' DB2 ')); + $dbc->set (' Server3 ',NewMysqlconnection (' db3 ')); A  the  + $DBC 1=$dbc->get (' Server1 '); - $DBC 2=$dbc->get (' Server2 '); $ $DBC 3=$dbc->get (' Server3 '); $  - $DBC 1->append ("Connection"); -  the Var_dump($dbc->get (' Server1 ')); - Var_dump($dbc->get (' Server2 '));Wuyi Var_dump($dbc->get (' Server3 '));

Review PHP design mode--Registration mode