PHP ʖ²ἯTH º󍋼/A Ղ 15. ҽӃµĽ⊍ Ŀ¼ ҽӃʇʲô ҽӃ׶ʲô ҽӃ²»ʇʲô ҽӃ´«µݼ/A ҽӃ·µ»ؼ/A ȡϻҽӃ ҽӃ¶¨λ ҽӃʇʲô º󍋼/A ưµ㼯A References inside the constructor ɏһ¼¶ ҽӃ׶ʲô