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---
layout: default
permalink: engine/functions/
title: Functions
---
Functions
=========
While [extensions](/engine/extensions/) are awesome for adding additional reusable functionality to Plates, sometimes it's easier to just create a one-off function for a specific use case. Plates makes this easy to do.
## Registering functions
~~~ php
// Create new Plates engine
$templates = new \League\Plates\Engine('/path/to/templates');
// Register a one-off function
$templates->registerFunction('uppercase', function ($string) {
return strtoupper($string);
});
~~~
To use this function in a template, simply call it like any other function:
~~~ php
<h1>Hello <?=$this->e($this->uppercase($name))</h1>
~~~
It can also be used in a [batch](/templates/functions/#batch-function-calls) compatible function:
~~~ php
<h1>Hello <?=$this->e($name, 'uppercase')</h1>
~~~