More often than not when you had solved a PHP error, the error still appear on your browser even though you have confirmed that it is solved. Normally this can be due to the browser cache. One easy way is to clear the browser cache so that you are able to load the new version of your web site.
Another way is for eg if you are using Fire Fox, try to open the test link in Internet Explorer, this should normally help you get the latest version of your test results.