在照彭武興先生的《PHP BIBLE》中所述，header可以送出Status標題，如
header("Status: 404 Not Found");
?>
就可以讓使用者瀏覽器出現檔案找不到的404錯誤，但是我試了這樣是不行的。
後來我到w3.org上查了http的相關資料，終於試出來了如何Header出狀態碼(Status)，與大家分享。
其實應該是這樣的:
Header("http/1.1 403 Forbidden");
?>
第一部分為HTTP協議的版本(HTTP-Version)
第二部分為狀態碼(Status)
第三部分為原因短語(Reason-Phrase)
三部分中間用一個空格分開，且中間不能有斷行符號,第一部分和第二部分是必需的，第三部分則是給人看的，可寫可不寫甚至亂寫:)。
還有，這一句的輸出必須在Html檔案的第一行。
下面我給出各代碼所代表的意思(是從w3.org上查到的,夠權威了):
* 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
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