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Cannot modify header information Error 解決方法

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在重新安裝ighttpd的時候，發現Error的訊息，看起來像是session初始錯誤。

Warning: Cannot modify header information - headers already sent by ......

看了一下錯誤訊息，推估是因為session宣告前還有HTML碼，因此稍微改變一下，將session_start() 移至最前面，緊鄰 "<?php "。

但是，還是沒解決問題，只好再繼續尋找解決辦法，發現更改php.ini 內的設定值就修好了，原因是因為網頁傳輸時採用header，造成緩衝區產生錯誤。

打開php.ini 搜尋「output_buffering」，將後面的值啟動就可以了(如果要設定緩衝區大小也可以給它一個值，如4096)。

例： output_buffering = on

儲存檔案，重新啟動Lighttpd即可(如果是使用Apache應該也是以相同的原理做修改~)

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