What is a function?
A function is just a container for a block of code. Functions are powerful because they enable you to create a section of code that can, if well-written, be copied and pasted from program to program saving you writing it each time.
In addition it makes debugging easier as you can track problems to individual blocks of code - the functions.
And also very attractive is that with a function you don't necessarily need to know how it works once written to use it - just like all the built-in functions in PHP, you can make it available to others and they can copy and paste it and it should work.
Here is a simple function in action:
<?php
function myfirstfunction() {
echo "My first function!";
}
myfirstfunction(); // call the function
?>
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