Mastering PHP 7

PSR-6 - caching interface

Performance issues are the ever-hot topic of application development. The effects of poorly performing applications can sometimes have serious financial impact. Back in 2007, Amazon reported a 100 ms increase in https://www.amazon.com/ load time and their sales decreased by 1%. Several studies have also shown that nearly half of the users are likely to abandon the website if the page load time is over 3 seconds. To address the performance issues, we look into caching solutions.

Both browsers and servers allow caching of various resources, such as images, web pages, CSS/JS files. Sometimes, however, this is not enough as we need to be able to control the caching of various other bits on the application level, such ...