public $name1;
public $name2;
public $name3;
public $name4;
/**
* [printThis description]
* @return [type] [description]
*/
public function printThis()
{
// var_dump($this);
// var_dump(new $this);
// var_dump(new $this);
// var_dump(__CLASS__);
// var_dump(get_class());
// var_dump(new self);
// var_dump(new static );
// var_dump(new static );
$this->name1 = new $this();
$this->name2 = new static();
$this->name3 = new self();
$this->name4 = new Obj();
}
}
class OtherObj extends Obj
{
}
// $this 是指对象的类名，即被实例化的类名
$a = new OtherObj();
$a->printThis();
var_dump($a);
<?php
class Obj
{
// 初始值不能是表达式
public static $a = 0;
public function getAdd2()
{
return self::$a += 2;
}
}
// 在父类中重写静态类
// 子类和父类的静态成员变量保存不同的值
class OtherObj extends Obj
{
public static $a = 0;
public function getAdd3()
{
echo parent::getAdd2();
return self::$a += 3;
}
}
$obj = new Obj();
$obj2 = new Obj();
echo $obj->getAdd2();
echo $obj2->getAdd2();
$otherObj = new OtherObj();
echo $otherObj->getAdd3();
echo $otherObj->getAdd3();
