空白行导致Warning: Cannot modify header information - headers already sent by

　　如果在执行php程序时看到这条警告:”Warning: Cannot modify header information - headers already sent by ….”

　　检查有 后面没有空白行，特别是include或者require的文件。不少问题是这些空白行导致的。

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"空白行导致Warning: Cannot modify header information - headers already sent by" was posted on Tuesday, September 2nd, 2008 at 4:57 pm.