Strange Errors in /usr/local/apache/logs/error_log

[sahith]

Recently I am having following error very frequently in my apache log located in /usr/local/apache/logs/error_log

<b>Fatal error</b>: Unknown: Cannot use output buffering in output buffering display handlers in <b>Unknown</b> on line <b>0</b><br />

Can anyone help me what this is about and how to fix it?

 

[mistwang]

It is a PHP code problem. please google it.

 

[sahith]

Yeah, i know. But why it is being reported in Apache error log repeatedly. Usually this kind of php errors get reported in error_log files inside user account from where php files being executed. I still wonder why this error reported in Apache/Litespeed error log. That way i cant able to track which script in the server responsible for this error too.

 

[mistwang]

http://php.net/manual/en/errorfunc.configuration.php#ini.display-errors
http://php.net/manual/en/errorfunc.configuration.php#ini.log-errors
http://php.net/manual/en/errorfunc.configuration.php#ini.error-log

PHP configuration regarding error logging is complicate.

 

[sahith]

Thanks for the references.

After thorough research, Came to know a wordpress plugin "WP Super Cache" responsible for these errors, once i disabled it, errors are gone. Wonder why that plugin logging errors to webserver log.