Home php教程 php手册 bom头的影响

bom头的影响

Jun 13, 2016 am 10:35 AM
bom header modify setcookie under Appear exist Influence of mistake

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
PHP:
ob_start();
在setcookie之前加上代码:

PLAIN TEXT
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。

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?
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

作者:volcano发表于2月 28, 2008 at 8:16 pm

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