A BOM In the beginning of your file brings about the webpage to begin output prior to the header command is interpreted, and may cause mistake messages together with other issues from the displayed site.??????? ??????? ????? ?????????????? ????????????????????Ngoài ra, n?u b?n s? d?ng t?t các ch?c n?ng vi?t t?t ho?c vi?t hoa t? ??ng ch? cái ??u