刚在网上看到一个家伙抨击了半天Smarty，ajax，并叫嚣着，凡是写blog的都是菜鸟，高手都是隐隐的，唉，那我这只菜鸟就继续再写点今天整理的一些个东西喽：
PHP header()
the function declaration: void header ( string string [, bool replace [, int http_response_code]])
The optional replace parameter indicates whether the header should replace a previous similar header, or add a second header of the same type. By default it will replace(true);
RFC2616有相关的所有的状态信息的说明, 就状态码，大体总结如下：
* 1xx: Informational - Request received, continuing process
* 2xx: Success - The action was successfully received, understood,
and accepted
* 3xx: Redirection - Further action must be taken in order to
complete the request
* 4xx: Client Error - The request contains bad syntax or cannot be
fulfilled
* 5xx: Server Error - The server failed to fulfill an apparently
valid request
| "100" ; Continue
| "101" ; Switching Protocols
| "200" ; OK
| "201" ; Created
| "202" ; Accepted
| "203" ; Non-Authoritative Information
| "204" ; No Content
| "205" ; Reset Content
| "206" ; Partial Content
| "300" ; Multiple Choices
| "301" ; Moved Permanently
| "302" ; Moved Temporarily
| "303" ; See Other
| "304" ; Not Modified
| "305" ; Use Proxy
| "400" ; Bad Request
| "401" ; Unauthorized
| "402" ; Payment Required
| "403" ; Forbidden
| "404" ; Not Found
| "405" ; Method Not Allowed
| "406" ; Not Acceptable
| "407" ; Proxy Authentication Required
| "408" ; Request Time-out
| "409" ; Conflict
| "410" ; Gone
| "411" ; Length Required
| "412" ; Precondition Failed
| "413" ; Request Entity Too Large
| "414" ; Request-URI Too Large
| "415" ; Unsupported Media Type
| "500" ; Internal Server Error
| "501" ; Not Implemented
| "502" ; Bad Gateway
| "503" ; Service Unavailable
| "504" ; Gateway Time-out
| "505" ; HTTP Version not supported
So， 举几个例子：
header("HTTP/1.1 404 Not Found", true, 404);
header("HTTP/1.0 401 Unauthorized");
header("Content-Type: text/html; charset=utf-8;");
header("Location:http://www.xxx.com");
RFC2616 http://www.faqs.org/rfcs/rfc2616