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This chapter is from the book

This chapter is from the book

PHP and MySQL by ExamplePHP and MySQL by Example

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This chapter is from the book

This chapter is from the book

PHP and MySQL by ExamplePHP and MySQL by Example

Learn More Buy

4.4 Chapter Summary

4.4.1 What You Should Know

Now that you have finished this chapter you should be able to answer the following questions:

  1. What are the PHP basic data types?

  2. What is the gettype() function?

  3. What is the difference between a scalar and a composite data type?

  4. What is the difference between a variable and a constant?

  5. When do you need double quotes? Single quotes?

  6. How can you see a backslash interpreted in the browser?

  7. How do you concatenate two strings?

  8. Why would you use a here-doc?

  9. What data type is represented by true or false? Are true and false case sensitive?

  10. What is NULL?

  11. Is "$_over-out" a valid variable name? Why or why not?

  12. Is it mandatory to initialize a variable?

  13. What function can you use to tell if a variable exists?

  14. How do you get rid of a variable?

  15. What is meant by scope?

  16. What is the function of the register_globals directive? In what file is it located? Is it on or off in your version of PHP?

  17. What are form variables?

  18. What is the difference between the GET and POST methods?

  19. What is the value of $_REQUEST?

  20. How do you create a constant?

  21. Why are constants useful?

  22. What is a "magic constant"?

4.4.2 What's Next?

Another important chapter basic to all programming languages, Chapter 5, "Operators," covers PHP's rich set of operators and how to use them to manipulate data; for example, how to perform arithmetic on numbers, compare strings and numbers, test equality, combine expressions, and test them with logical operators, bitwise operations, and more.

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