PHP Script to Make Capital Letters Automatically

On the previous article I wrote about how to make capital letters automatically use CSS script. If you want to read it, you can click HERE.
Now, in this article I want to write about make capital letters automatically use PHP script. It is more simple than use CSS Script.
The PHP script like that:
<?php echo strtoupper('test again'); ?>

Information:
strtoupper => PHP script to make capital letters.
test again => word on capital letters, you can type your word that you want to make capital letters.

So the display like that.

Happy Trying