DevShed has posted the final part of their series on handling exceptions in PHP5 applications. In this part they wrap up the creation of their modular exceptions class.
By means of a hands-on approach, this series walks you through using inheritance to build finely-tuned exception subclasses. These subclasses can be used to handle, via multiple "try-catch" blocks, several failures that might occur during the execution of a given web application.
They show how to handle MySQL exceptions with two different subclasses - one for the MySQL connection itself and another for problems with the results. They then merge these two classes into one and show how to use the new hybrid creation in a sample SQL connection and query.