PHP 单例模式继承的实现方式
/** * @author xiaojiang * 方式1 */ class father{ static $models = []; static public function getInstance(){ $name = get_called_class(); if( !isset( self::$models[$name] ) ){ self::$models[$name] = new $name(); } return self::$models[$name]; } public function m1(){ echo "fm1"; } public function m2(){ echo "fm2"; } } class child extends father{ public function m1(){ echo 'cm1'; } } father::getInstance()->m1(); child::getInstance()->m1(); /** * 方式2 */ class base{ static protected $ins = []; static public function getInstance(){ $cName = get_called_class(); if( !isset(static::$ins[$cName]) ){ static::$ins[$cName] = new $cName; } return static::$ins[$cName]; } public function m1(){ return "base m1"; } public function m2(){ return "base m2"; } } class cbase extends base{ //static public $ins = null; static public function getInstance(){ return parent::getInstance(); } public function m1(){ return "cbase m1<br>"; } } echo base::getInstance()->m1()."<br>"; echo cbase::getInstance()->m1();
生命只有一次。