utf-8 ef bb bfutf-16 big endian fe ffutf-16 little endian ff feutf-32 big endian 00 00 fe ffutf-32 little endian ff fe 00 00
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解决方法：在进行php session 操作时，如果出现：warning: cannot send session cookie – headers already sent…”或者“cannot add header information – headers already sent…”
只需对php.ini中的output_buffering进行设置，默认值为no，修改为1即可。