1. Creating Dynamic Web Sites Part 3
Chapter 3
Creating Dynamic Web Sites
Part 3

2. functions
function function_name( ){ // function code. }

3. Reasons for a function
To associate repeated code with one function call.
To separate out sensitive or complicated processes from other code.
To make common code bits easier to reuse.

4. index.php Script 3.7 on page 96
ch03\index.php

5. Function Arguments
function print_hello($first, $last) { // Function code } print_hello(‘Andy’,’Dalton’); $surname=‘Dalton’; print_hello(‘Andy’,$surname);

6. calculator.php Script 3.8 on page 98-99
ch03\script_03_08\calculator.php

7. Default Argument Values
function greet($name, $msg=‘Hello’){ echo “$msg, $name”; } greet($username, $message); greet(‘Zoe’); greet(‘Sam’, ‘Good evening’);

8. calculator.php Script 3.9 on page 101-103
ch03\script_03_09\calculator.php

9. Return Values from a Function
function find_sign($month, $day ){ // function code. return $sign; } $mysign = find_sign(‘October’, 23); echo find_sign(‘October’, 23);

10. calculator.php Script 3.10 on page 105-107
ch03\calculator.php