bom头的影响
在setcookie的时候出现下面错误。 Cannot modify header information - headers already sent by .... 这个错误非常之常见,如果在setcookie之前输出了任何文本内容,便会有上述错误提示。由于页面头部require了若干文件,一行行排查是很麻烦的事情,因此,我在页面顶部加上: PLAIN TEXT PLAIN TEXT 继而用vim打开了源文件,发觉vim有打开bomb选项,怀疑因此给代码添加了隐藏的字符串,关闭之: set nobomb 问题解决。 BOM是什么意思? 作者:volcano发表于2月 28, 2008 at 8:16 pm 版权信息:可以任意转载, 转载时请务必以超链接形式标明文章原始出处和作者信息及此声明 永久链接 - http://www.ooso.net/index.php/archives/378
PHP:
ob_start();
在setcookie之前加上代码:
PHP:
ob_get_clean();
这是为了获取setcookie之前页面输出的内容。页面运行后,显示输出了一个空字符串,也就是说,setcookie之前没有任何输出。
BOM是“Byte Order Mark”的缩写,用于标记文件的编码。并不是所有的文本编辑工具都能识别BOM标记

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