This website is intended to learn php easily with examples. The language is kept simple for non-techies and beginners.
Php is a popular and powerful web programming language to design dynamic web pages. There are wide range of complex web applications that can be and are developed using php. Some of them are Blogs like Wordpress, forums like Phpbb. You can develop your own web application using php and Mysql.
There are lots of php scripts and programs available in internet. You should learn php programming to customize them to suit your needs. Indeed there are lots of professionally developed opensource php scripts. You need them to customize these scripts suitable to your requirements.
Using static web programming languages like html can hamper you ability to change the website later. When you website grows large you cannot change the navigation menu & navigation bar of the website. If you have to add a link you your main menu, you will have edit each and every page. But if you use php you can seperate the navigation menu and change the navigation links on fly which will be reflected over all the site.