Create exponentials with ease
In previous version of PHP, you need to use the Pow(a, b) function to create an exponential of a^b. But, in the new version of PHP, you just have to use the ** operator. In addition to that, you can also use ** = operator as well. This will help you to avoid having too many Pow() functions, which will help you to minimize the functional errors.
Syntax of PHP 5.5
Syntax of PHP 5.6
Resource : What is new in latest PHP version – 5.6.0?