session_start(): Cannot send session cookie

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /mnt/www/notes/include/test.php:1)

文件test.php 是用 utf-8 编码的, 如果文件开始有 BOM , 也就是不是无 BOM 格式的 UTF-8编码, 那么就会出现这个问题.

因此解决方法只要将该文件另存为无 BOM 格式的 UTF-8编码的文件即可.

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References:

http://webofficer.blog.163.com/blog/static/4185810200911147533990/