PHP syntax and code structure Mocktest

PHP comments are ignored by the PHP interpreter and are used for documentation purposes. They can be either single-line (starting with //) or multi-line (enclosed within /* */).

The require_once statement in PHP is similar to require, but it ensures that the specified file is included only once, regardless of how many times the statement is executed. This is useful for preventing multiple inclusions of the same file, which can lead to errors.