Answer: Learning Objectives - In this module, we will learn about the functions. Next, we will learn about how to send mails using PHP. In addition, we will learn regular expressions, predefined functions and its uses. We will also understand how to manipulate with system files, error handling and debugging. Topics - What is Functions , Creating PHP functions, PHP functions with parameters, Argument by reference, setting default values for function parameters, dynamic function calls, PHP mails, how to send text mail, how to send html emails , how to send attachments with emails, regular expressions, POSIX regular expressions, predefined character ranges, Regexp POSIX functions, PERL style regular expressions, Regexp PERL compatible functions, Date and time functions,Built-in functions, file inclusion, file manipulations, exception handling, bugs debugging, Annie’s Quizzes, LAB, Q & A and Quick Recap.