A BOM at the start of your file leads to the web site to start output before the header command is interpreted, and will lead to mistake messages and also other problems during the shown web page.??????? ??????? ????? ?????????????? ????????????????????H?p tho?i b?t lên t? ??ng khi kh?i ??ng: Nh?n vào m?c Empower Dialog at Startup ?? ch??ng trìn