PHP Tuning
For development site Change the php.ini file setting for apache:
display_errors=On so that PHP errors can be known
and change the setting
error_report = E_ALL && ~E_NOTICE (Report all errors except notice type)
ServerName pr.example.com
ServerAlias pr.example.com
DocumentRoot /sites/www/pr.example.com/public_html/
ErrorLog /sites/www/pr.example.com/logs/error.log