What is "php-8"

PHP 8.0 is a major upgrade (major) of the PHP language. It contains new features and optimizations including named arguments (named Arguments), guy Union, attributes (Attributes, also known as Annotations), promotion of arguments in the constructor (constructor Property Promotion), match expression, nullsafe operator, JIT compilation (Just in time) and type system improvements, error handling and consistency. This version was released on November 26, 2020.