Trying to grasp functions

Dutch_MaFia-boy

I understand that functions are blocks of code that can be referred to to run.

I would like to learn how to call functions from my functions.php page and have the include statement on other pages.....using the following example.

functions.php page-

<?php
function tentimes($number*10)
   {
   return $number * 10;
   }
?>

<html>

<?php
include('functions.php');

print tentimes(50);

</html>
?>

Isn't that the point of functions - to refer (call) a larger block of code....kinda like a shortcut?? - I'm speaking of when defining your own functions....

I was reaidng this webpage....still a little confused about how functins work and the syntaxes they use - arguements vs. no arguements, brackets

http://www.theukwebdesigncompany.com/articles/basic-php-functions.php

thanks

Chris_Evans

Functions are really very simple, and your idea to save you keep rewriting the same piece of code is correct. Here's an example of a function in the same file as the code that calls it (this is generally how it is done).

function ChooseHouse($name) {
    if($name == "Bulldozer") {
        $string = "Your house will be knocked down by a bulldozer";
    } elseif($name == "Workman") {
        $string = "Your house will be knocked down by a workman";
    } else {
        $string = "Your house won't be knocked down by anyone!";
    }
    return $string;
}

DO THIS COMMAND

$house = "Well.... I dunno";
$page = ChooseHouse($house);
echo $page;

DO THIS COMMAND

$house = "Workman";
$page = ChooseHouse($house);
echo $page;

So what's the advantage I here you ask? Well, without a function where I've written $page = and then a call to the function, I would have to instead have rewritten the code. Great little feature!

Hope this explains it. By the way: DO THIS COMMAND isn't anything you need to, I was just saying that some other PHP coding could go here.

Chris

Chris_Evans

PS: If you look at the function closely, you'll notice that my first $house = "Well... I dunno" example would just return a: "Your house won't be knocked down by anyone!" whereas the other would return a: "Your house will be knocked down by a workman"

Hope this helps,

Chris 🙂

ahundiak

Are you asking why your function does not work?
This:
function tentimes($number*10)
Should be:
function tentimes($number)