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Lesson 19 - Exceptions in PHP pt. 2

In the previous lesson, Exceptions in PHP, we introduced you all to exceptions, and learned to throw and catch them.

Exceptions under the hood

Let's briefly go over how exceptions work internally. First, PHP executes the code in the try block in a special mode. We've already gone over the benefits of exceptions in the previous lesson, but just for kicks, exceptions are a unified way of reacting to errors and add clarity to the code. This way, we don't have worry about the function return type.

However, exceptions do have a dark side - performance. Executing a code in a special mode in a try block leads to a loss of performance, so the code using exceptions may be 10 times slower than code using conditions. Since we are talking microseconds, it won't matter for our intents and purposes. Regardless, it's not a good idea to put the entire program into a try block :) You should only use them at specific places, i.e. where


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In tutorial, we'll explain the relationship between exceptions and OOP design, the types of built-in PHP exceptions, and how to react to exceptions.

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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 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 College The author learned IT at the Unicorn College - a prestigious college providing education on IT and economics.
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