This document provides an introduction and overview of PHP for beginners. It discusses PHP's use for building websites, how PHP code is run on web servers and accessed through browsers. It then highlights some key advantages of PHP like being free, cross-platform, and widely used. It demonstrates a basic "Hello World" PHP program and shows how to output HTML forms and formatted numbers. Finally, it outlines some basic rules of PHP programs regarding tags, syntax, whitespace, comments, and case sensitivity.

1. Orientation and First Step
PHP's Place in the Web World
What's So Great About PHP?
PHP in Action
Basic Rules of PHP Programs

2. PHP’s Place in the world
• Programming language used mostly for building websites
• Runs on web server and accessed through web browsers

5. What's So Great About PHP?
• PHP is free(As in Money)
• PHP is free(As in Speech)
• PHP is Cross-Platform
• PHP is widely used
• PHP hides its complexity
• PHP is built for web programming

6. PHP in Action
• PHP interpreter runs the command in between <?php ?> tags
• Pages ends with extension .php

7. Hello World Program

8. Output

9. HTML form for submitting data

11. Output

14. Printing form using here document

15. Output

16. Printing a form

19. Printing formatted numbers

21. Basic rules of PHP programs
• <?php is start tag
• ?> is end tag

22. Multiple start and end tags

24. Whitespace and case sensitivity
• Statement is ended by semicolon(;)
• Blank spaced between the statements are ignored by interpreter
• White spaces(enter, tab, newline) does not affect the program
execution

27. Spacing

29. Keywords and function names are case
insensitive

31. Comments
• // and # are used for single line comments
• /* */ is used for multi line comments