Error logging with WAMP server in PHP

The line ; log_errors is just a comment for the following block, for the purpose of showing you what the settings are in dev vs production. You uncommented four lines which aren't meant to control anything, and I'm surprised your Apache service doesn't have problems starting up because of it.

What you need to do is look for the line:

log_errors = Off

And change the value to On

That said, once you restart the Apache service, the settings should take effect. However, I was unable to get WampServer to properly log php errors despite these settings. Apache will not start up when I specify the error_log parameter.