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上网搜索了一下，大致有两种解决方案，整理了一下，主要的造成的原因和解决办法如下：
1.php.ini配置问题，解决办法：打开 php.ini 然后把 output_buffering 设为 on ,重启appache即可。
2.使用windows记事本编辑的wp-config文件造成(UTF8编码和BOM冲突)，解决办法：使用Notepad++、UltraEdit、EditPlus等编辑器编辑文件，一般的主机管理系统自带的编辑功能也不错。
或者，将wp-config.php另存为ANSI编码。
如果是安装PHP其他程序或者自己写的程序出现以上问题，除了以上两种可能，还有可能是setcookie的问题，解决办法是在输出内容之前，产生cookie，可以在程序的最上方加入函数 ob_start(); 格式如下：
ob_start ：打开输出缓冲区
函数格式：void ob_start(void)