The main language for development work is JAVA, but I am maintaining legacy projects created with PHP 5.* versions. In the case of PHP, I learned it by myself with a thin book and working on the job. When I was working on advanced tasks, I felt frustrated because I didn't have a deep knowledge of PHP. However, after taking this lecture, I had the opportunity to properly learn about PHP's basic grammar and development methods. Of course, I learned based on PHP 7, but there was no problem applying what I learned in this lecture to a PHP 5.* project. I think proper learning of version 7 would start with the OOP lecture. I will take a break here for a while and review my work and study the OOP lecture. I would like to thank the instructor who answered my questions with sincerity, and the instructor who gave me the opportunity to learn modern PHP.