How do I define a constant in PHP?

It is not actually that common a requirement to define a constant in your PHP code, but when you need to do so you will know about it, so it's useful to know how to go about doing it.

And here is how:


<?php

define('NAME', 'Tarquin');

?>

This defines a constant called NAME and assigns it the value of Tarquin. Now assuming you don't ever change your name (well, maybe if you're called Tarquin...) then this would be a possible instance of defining a constant.

How do you access it? Like this:


<?php

echo 'Hello, ' . NAME;

?>

It is very important to note that the constant is printed outside of any quotation marks; include it within them and you will just see NAME printed to screen rather than the actual value of the constant.

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