Learning PHP, MySQL, and JavaScript

Test Your Knowledge: Questions

Question 3-1

What tag is used to cause PHP to start interpreting program code? And what is the short form of the tag?

Question 3-2

What are the two types of comment tags?

Question 3-3

Which character must be placed at the end of every PHP statement?

Question 3-4

Which symbol is used to preface all PHP variables?

Question 3-5

What can a variable store?

Question 3-6

What is the difference between $variable = 1 and $variable == 1?

Question 3-7

Why do you suppose that an underscore is allowed in variable names ($current_user) whereas hyphens are not ($current-user) ?

Question 3-8

Are variable names case-sensitive?

Question 3-9

Can you use spaces in variable names?

Question 3-10

How do you convert one variable type to another (say, a string to a number)?

Question 3-11

What is the difference between ++$j and $j++?

Question 3-12

Are the operators && and and interchangeable?

Question 3-13

How can you create a multiline echo or assignment?

Question 3-14

Can you redefine a constant?

Question 3-15

How do you escape a quotation mark?

Question 3-16

What is the difference between the echo and print commands?

Question 3-17

What is the purpose of functions?

Question 3-18

How can you make a variable accessible to all parts of a PHP program?

Question 3-19

If you generate data within a function, provide a couple of ways to convey the data to the rest of the program.

Question 3-20

What is the result of combining a string with a number?

See the section Chapter 3 Answers in Appendix A for the answers to these ...