在这个例子中,如何从对象$containerObj->bar
中的getContainerID()
方法访问对象$containerObj
中的属性,或者至少获取指向$containerObj
的指针?
class Foo {
public $id = 123;
}
class Bar {
function getContainerID() {
... //**From here how can I can access the property in the container class Foo?**
}
}
$containerObj = new Foo();
$containerObj->bar = new Bar();
echo $containerObj->bar->getContainerID();
你不能
用这种方式做到这一点。对类的引用可以分配给多个变量,例如:
$bar = new Bar();
$container = new Foo();
$container->bar = $bar;
$container2 = new Foo();
$container2->bar = $bar;
现在 PHP 应该返回哪个 Foo 容器?
你最好改变你的方法,让容器知道分配给它的对象(反之亦然(:
class Foo {
public $id = 23;
private $bar;
public function setBar(Bar $bar) {
$this->bar = $bar;
$bar->setContainer($this);
}
}
class Bar {
private $container;
public function setContainer($container) {
$this->container = $container;
}
public function getContainerId() {
return $this->container->id;
}
}
$bar = new Bar();
$foo = new Foo();
$foo->setBar($bar);
echo $bar->getContainerId();