Lesson 18 - Exceptions in PHP

PHP OOP Exceptions in PHP

In the previous lesson, Guestbook in PHP - continuation, we finished making a simple guestbook with modular captchas using interfaces. Today, we are going to dive deeper into the world of object-oriented programming by learning about exceptions. This is the last major construct that we hadn't discussed yet (every programmer should know about exceptions).


An exception could simply be described as a runtime error. A perfect textbook example would be dividing by zero or reading a non-existent file. Exceptions mostly occur when a user enters invalid input.

Modern programming languages use exceptions whenever something goes wrong. Unfortunately, PHP has a different and older non-object-oriented system for handling errors, called ErrorReporting. You all have definitely are aware of it at this point. When something goes wrong, PHP writes a notice, warning or fatal error (if the error was really serious).

Going over exceptions in PHP is kind of weird knowing that PHP itself doesn't use them much :) Some of its functions return false in case of failure, while others cause errors. Only the most modern ones throw exceptions.

Exceptions are an object-oriented way to deal with runtime errors, so we should definitely use them in our applications. The main reason being that they simplify and clarify our applications (like most object-oriented constructs). We are going to continue using them in the proceeding PHP courses.


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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at ICT.social. He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
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