In this chapter, we discussed new OOP features, such as type hints, anonymous classes, the throwable interface, group use declaration for namespaces, and two important new operators, the Spaceship or Combined Comparison operator and the null Coalesce operator. Also, we discussed the uniform variable syntax and a few other new features, such as new syntax for the contact array definition, options array for the session_start() function, and removal of multiple default cases in the switch statement.
In the next chapter, we will discuss how to improve the application's performance. We will discuss Apache and NGINX and different settings for them to improve performance.
We will discuss different settings for PHP to improve its performance. The Google page speed module, CSS/JavaScript combining and compression, CDN, and so on will also be discussed.
