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Posted by Tom on 30th March 2012
PHP: How to write and call your own function (part two)
- How to call a built-in function in PHP (part one)
- How to write and call your own function in PHP (part two)
- How to safely call a dynamic function in PHP (part three)
Introduction
PHP has a library of built-in functions. Different functions are available depending on the PHP version you are running, and the extensions you enable. You can extend this library at run-time by writing your own functions.
This article demonstrates how to call a built-in function, how to write and call your own function, and how to safely call a dynamic function.
How to write and call your own function in PHP
You can extend the functions available in PHP by writing your own. Taking the scenario from part one, I'm planning on having lots of BBQs over the summer - but I don't want to have to copy & paste the code lots of times, only to change a couple of numbers. Instead we can encapsulate the code into a neat little function.
// Your own function.
function sausageCalculator($attendees,$sausages_each)
{
$sausages_required = $attendees*$sausages_each;
$sausages_required = ceil($sausages_required);
return $sausages_required;
}
// My first BBQ. 12 sausages.
echo "You need to buy ".sausageCalculator(9,1.25)." sausages!";
// Less people this time, but Joel is coming, so the average
// sausage consumption goes up considerably. 18 this time.
echo "You need to buy ".sausageCalculator(7,2.5)." sausages!";
?>
Note, you can also condense the sausageCalculator function into just one line of code.
// This does exactly the same as the above, but
// instead carries out all the calculations in one
// line of code.
function sausageCalculator($attendees,$sausages_each)
{
return ceil($attendees*$sausages_each);
}
?>
That's the end of part two. I hope you've mastered how to write and call your own functions in PHP. If you like this article, please show the love by leaving a comment, liking our Facebook page, or following @switchplane on Twitter. You can also follow me personally on Twitter @tom_fielder.
Read the next part
If you would like to continue reading, you can read the next part: How to safely call a dynamic function in PHP.
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