请教！为什么会出现warning?

ltkun

http://www.sysunix.com/modules.php?name=Forums


Warning: Cannot modify header information - headers already sent by (output started at /mail/wdpost/http/htdocs/VirtualHost/www.sysunix.com/header.php:32) in /mail/wdpost/http/htdocs/VirtualHost/www.sysunix.com/includes/sessions.php on line 222

Warning: Cannot modify header information - headers already sent by (output started at /mail/wdpost/http/htdocs/VirtualHost/www.sysunix.com/header.php:32) in /mail/wdpost/http/htdocs/VirtualHost/www.sysunix.com/includes/sessions.php on line 223

khj99

意思就是你在输出头的时候，比如：
header()，session()这些函数调用。
在这些函数调用之前，就有内容输出的话就会出错，而这些函数调用之前是不能有任何内容输出的。如下面的例子
<?
echo "test";
session_start();
?>
这就会报错。

ltkun

谢谢！我再看看代码