One of the most popular reasons to use the header function in PHP applications is to do a redirect, but the webshop.com blog wants to remind you that there's more to it than just that.

If you are a web developer and you’ve ever worked with PHP you have probably come across the PHP header() function in the past. You most likely used it to implement a hard redirect; but you may not have understood exactly what was happening behind the scenes every time you call this handy function. Let’s take a look at what the header() function does and find some uses for it other than its most common use–redirects.

They look at what the header function is for, what HTTP headers are (and some examples) as well as a few examples of use outside of redirects including defining content types, response codes and cache control.