If you are concerned about how your site works, or you are just trying to fix a problem or trying to debug your site, mainly for developers - the error log addon is a simple but very effective error logger for your PHPMember website. It logs all kind of errors that might occur while a transaction, or simple site navigation.

Not only that but it logs every MYSQL query error, is logs failed queries so that you know exactly what is going on with your site. It logs API requests, it also logs generic errors, and custom errors and site warnings. The error log addon makes error tracking a breeze.
* Price: FREE

PHPMember 1.2+ products
Apache Server + PHP5+Mysql