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I have a CenOS server and i want to enable PHP error logging to a file. I have edited the php.ini file and set

error_log = /var/log/httpd/phperror.log

and also

log_errors = On

I've restarted the apache server with service httpd restart but still the /var/log/httpd/phperror.log does not get created and no errors are logged. Any idea why?

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Did you check the permissions of this file path? Is it writeable by httpd process? – Khaled Jan 16 '12 at 13:33
I even put /tmp/phperror.log and the file still did not get created. – daniels Jan 16 '12 at 22:38

You can do it by creating an empty file in dir /var/log/httpd/

#touch /var/log/httpd/phperror.log

After creating the empty file, restart the apache server and check it the log file updated with the error log.

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...and add write permissions for apache user: chown apache. /var/log/httpd/phperror.log and chmod 750 /var/log/httpd/phperror.log – stderr Jan 16 '12 at 14:32
I even put /tmp/phperror.log and the file still did not get created. – daniels Jan 16 '12 at 22:38

It might be a better/easier idea to send the php errors to syslog. You won't have to worry about permission problems and the file should already be rotated.

error_log = syslog

Depending on your OS the errors should then go to /var/log/messages or /var/log/syslog

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