PHPオブジェクト転送
name = 'Zhang San';
$lisi = $zhangsan;// zhangsan lisi, lisi zhangsan 。
$lisi = 'abc'; // 'abc' , lisi zhangsan
echo $zhangsan->name . PHP_EOL;
name = 'Zhang San';
$lisi = &$zhangsan;// zhangsan 。
$lisi = 'abc'; // 'abc' , lisi zhangsan
echo $zhangsan->name . PHP_EOL;//PHP Notice: Trying to get property of non-object
echo $zhangsan . PHP_EOL;