[PHP] A common use method of factory pattern

setting){
			$this->setting=new Setting();
		}
		return $this->setting;
	}
}
class Setting{
	public function __construct(){
		echo 1111;
	}
}
$test=new test();
$setting=$test->getSetting();
$setting2=$test->getSetting();

//判断两个对象是否是同一个对象
var_dump($setting===$setting2);
//看编号,也能看出来
var_dump($setting);
var_dump($setting2);

//属性中有减号的处理
$name="x-b";
$test->$name=2;

var_dump($test);

//$test->x-b;//直接使用上面的属性,会被认为是一个减号
/*
报错:
PHP Notice:  Use of undefined constant b - assumed 'b' in D:\phpServer\WWW\test\
test.php on line 11

Notice: Use of undefined constant b - assumed 'b' in D:\phpServer\WWW\test\test.
php on line 11

*/

echo $test->{'x-b'}; //这种属性里面有-的这样包一下