A significant advantage of computers is that they can perform repetitive tasks easily and efficiently. Instead of writing repetitive code you can write a set of statements that processes some data and then have the computer execute them repeatedly by using a construct known as a loop. Loops come in several different flavors in PHP: for, while, do-while, and foreach. I'll introduce you to each of them and show you how they can making repetitive tasks straightforward and easy to maintain.

The tutorial explains a use case for each of the loop types and includes a bit of sample code showing how to put it into practice. It also shares two special keywords that can be used to bypass or break out of your current loop - break and continue.

Here's his list:

• Semicolon after a while - a small problem with big (infinitely looping) consequences)
• empty() and magic __get method - __get will hit first, then empty
• Missing semicolon after break or continue - a classic that can make switches and evaluations difficult to debug

Comments on the post include a few others: working with variables by reference, comparisons with == versus === and strpos finding the first character in a string.