If you have Local Values overriding master values, you won't change its values in php.ini take a look for those variables in a .htaccess or in the virtual-host config file.

...
        php_admin_value register_globals On
        php_admin_value display_errors On
        php_admin_value error_reporting E_ALL
</VirtualHost>

If you edit vhost, restart apache, .htaccess edits don't need apache to restart