php error logs

in your php.ini file set errorlog to a file in a folder writable by the web server user (assuming you're running apache modprefork) the php.ini file location varies with distribution which are you using?

If this is Apache + mod_php on Debian or Ubuntu, the relevant php.ini file is /etc/php5/apache2/php.ini

log_errors = On

That will make PHP errors show up in Apache logs by default.

If you want to send error messages to another file, you can also add

error_log = /path/to/error_log

but you'll need to make sure that the log file is writable by www-data.

Got. Thanks.