Warning: Cannot modify header information - headers already sent by

如果在执行php程序时看到这条警告:"Warning: Cannot modify header information - headers already sent by ....".

有以下几种解决方法:

1. Blank lines (空白行):

,检查后面没有空白行，特别是include或者require的文件.不少问题是这些空白行导致的。

2. Use exit statement (用exit来解决):在header后加上exit();

header ("Location: xxx");exit();

3.用Javascrīpt来解决:

self.location( file.php );"; ?>

可以用Javascrīpt来代替header。另外需要注意，采用这种方法需要浏览器支持Javascrīpt.

4. 用输出缓存来解决:

... HTML codes ...

... PHP codes ...

header ("Location: ....");

ob_end_flush();

?>

·Warning: mysql_fetch_array():(2013-11-28)
·Warning: Missing argument 3 for photo_bigclass()(2013-11-28)
·Warning: mssql_connect() [function.mssql-connect]:(2013-11-28)
·Warning: mysql_fetch_assoc() expects parameter 1 to be resource(2013-12-02)
·php 提示Warning: mysql_fetch_array() expects(2014-01-09)
·Warning: mysql_num_rows():(2014-01-14)
·Warning:chmod() has been disabled for security reasons in(2014-08-23)
·php提示 Warning: touch() [function.touch]: Utime failed: Permission denied in(2014-09-20)
·php提示Warning: file_get_contents(): couldn’t resolve(2014-09-20)
·PHP Warning:phpinfo() has been disabled函数禁用(2014-09-21)
·php 提示Warning: mysql_fetch_array() expects(2014-09-21)
·php下foreach()错误提示Warning: Invalid argument supplied for foreach()(2014-09-22)
·phpmyamdin安装出现Warning: require(./libraries/Error_Handler.class.php) 错(2015-04-04)
·PHP Warning: implode() [function.implode]: Invalid(2015-04-08)
·PHP错误WARNING: SESSION_START() [FUNCTION.SESSION-START]解决方法(2020-11-25)
·PHP错误Warning: Cannot modify header information - headers already sent by解决方法(2021-04-14)

相关文章