Get up to 80 % extra points for free! More info:

Lesson 18 - 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).

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.


 

...End of the preview...
Continue further

You will gain knowledge worth hundreds of thousands for a few crowns

You've come here and that's great! We believe that the first lessons showed you something new and useful
Do you want to continue the course? Go to the premium section.

Buy this course

Buy all currently available lessons with exercise submitting and other features for just $18
Current account balance $0
By buying this package, you'll have access to all 34 articles (26 lessons, 8 practical exercises) in this course.

This article is licensed: Premium, by buying this article, you agree with the terms of use.

What will you get from us in the next lessons?
  • Unlimited and permanent access to individual lessons.
  • High quality IT knowledge.
  • Skills to help you get your dream and well-paid job.

Article description

Requested article covers this content:

In this tutorial, we're going to cover what exceptions are in OOP. We'll show you how try-catch blocks work and how exceptions make PHP apps more readable.

You gain credits by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.

Article has been written for you by David Capka Hartinger
Avatar
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.
Unicorn university David learned IT at the Unicorn University - a prestigious college providing education on IT and economics.
Activities