PHP 4. Tutorial - Functions

Hello,
This is 4. tutorial for PHP.

This functions is private and user maked functions.

<?php
function sayHello()
{
echo("Hello");
}
?>

If you try this, you can see blank screen.. If you want see 'Hello' world, you must get function.

<?php
sayHello();
?>

You can use variables when calling functions.

<?php
function outputHTML($data)
{
echo($data);
}
outputHTML("This Is User Maked Function");
?>