static::$instance = $container;
}
//这样做，启动单例的作用
public static function getInstance()
{
return static::$instance;
}
}
class A1 extends B1
{
public function __construct()
{
//$this->setInstance($this);
static::setInstance($this);
}
public function hello()
{
echo "A1 hello Method" . PHP_EOL;
}
}
class A2 extends B1
{
public function world()
{
echo 'A2 world Method' . PHP_EOL;
}
}
$a1Obj = new A1();
B1::getInstance()->hello();
//输出 A1 hello Method
A2::getInstance()->hello();
<?php
class A1
{
public static function getInstance()
{
return new self();
}
}
class B1 extends A1
{
}
$obj = B1::getInstance();
var_dump($obj);
//object(A1)#1 (0) { }
class A
{
public static function getInstance()
{
return new static();
}
}
class B extends A
{
}
$obj = B::getInstance();
var_dump($obj);
//object(B)#2 (0) { }
