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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