PHP Loops

Loops are used in programming to iterate over an item, either for a known or unknown amount of times, until a certain criteria has been reached.

You have the choice of writing a single loop and specifying how it ends and writing the same code over and over again to satisfy every iteration of the loop (this will only work if you know the number of times the loop will run). The choice is yours.

Traditional web applications reload the whole page when clicking a link, modern web applications only reload the content that has changed.

As the web has matured, web applications often have a large amount of overhead; reloading every aspect of the page on each click including JavaScript and CSS vastly increases the overheads.

An important part of computer programming is implementing mathematic operations. Maths can be used to implement many functions in an application; be it to include functionality that is obviously maths related, or to implement functions that may not immediately appear, to the user, as a maths problem; such as calculating the window size to maintain the correct aspect ratio, or to calculate the width of a field that is to be half the width of the window.