ZEND PHP 5 Certification STUDY GUIDE

38 ” Functions
{
}
echo "Hello World!";
hello(); // Displays "Hello World!"
Returning Values
All functions in PHP return a value—even if you don’t explicitly cause them to. Thus,
the concept of “void” functions does not really apply to PHP. You can specify the
return value of your function by using the return keyword:
function hello()
{
return "Hello World"; // No output is shown
}
$txt = hello(); // Assigns the return value "Hello World" to $txt
echo hello(); // Displays "Hello World"
Naturally, return also allows you to interrupt the execution of a function and exit it
even if you don’t want to return a value:
function hello($who)
{
echo "Hello $who";
if ($who == "World") {
return; // Nothing else in the function will be processed
}
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
}
echo ", how are you";
hello("World"); // Displays "Hello World"
hello("Reader") // Displays "Hello Reader, how are you?"