php code pages and does not correspond to the encoding Problem ordering

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header ( "Content-of the type: text / HTML; charset = xxx") 
AddDefaultCharset xxx 
<META HTTP-equiv = "Content-of the type" Content = "text / HTML; charset = xxx"> 
If you are a web programmer, you each page to add header ( "content-type: text / html; charset = xxx"), to ensure that it can display correctly on any server, portability