What is a function?
<?php
$a = readLine("Your message: ");
echo str_rot13($a) . "\n";
?>
Let's make functions to do stuff!
<?php
echo add(2,2) . "\n";
echo sub(3,2) . "\n";
function add($a, $b) { return $a + $b; }
function sub($a, $b) { return $a - $b; }
function mul($a, $b) { return $a * $b; }
function div($a, $b) { return $a / $b; }
?>
<?php
$n = 1;
while ($n <= 10) {
if (is_even($n)) {
echo "{$n} is even.\n";
} else {
echo "{$n} is odd.\n";
}
$n = $n + 1;
}
function is_even($a) {
return ($a % 2) == 0;
}