<?php
//生成对象的6种方法
class Demo1{
public $name = 'PHP中文网';
public function getName(){
return $this->name;
}
public function getObj(){
return new self();
}
public function getStatic(){
return new static();
}
}
class Demo2 extends Demo1
{
public function getNewObj(){
return new parent();
}
}
//1、使用new 类名() 来创建一个对象
$obj = new Demo1();
echo $obj->name;
echo "<hr>";
//2、将类名,以字符串的方式放在一个变量中
$className = 'Demo1';
$obj1 = new $className();
echo $obj1->name;
echo "<hr>";
//3、 用对象来创建对象,并且他创建的是一个新对象
$obj2 = new $obj();//注意:与$obj2 = $obj不同
echo $obj2->name;
echo "<hr>";
//4、用new self()
$obj3 = $obj->getObj();
echo $obj3->name;
echo "<hr>";
//用new parent() 来创建一个对象(基于父类)
$obj4 = (new Demo2)->getNewObj();
echo get_class($obj4);
echo $obj4->name;
echo "<hr>";
//基于当前调用的类来创建:new static
$obj5 = (new Demo2)->getStatic();
$obj6 = (new Demo1)->getObj();
echo get_class($obj5);//基于 new static
//new static 创建的对象,直接与调用者绑定,静态延迟绑定
echo get_class($obj6);//基于 new self
echo $obj5->name;
echo $obj6->name;
?>