Chapter 3 Creating Dynamic Web Sites Part 3

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

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.

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

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

calculator.php Script 3.8 on page cript_03_08/calculator.php cript_03_08/calculator.php ch03\script_03_08\calculator.php

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

calculator.php Script 3.9 on page cript_03_09/calculator.php cript_03_09/calculator.php ch03\script_03_09\calculator.php

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

calculator.php Script 3.10 on page alculator.php alculator.php ch03\calculator.php