Function to Swap words inside double curly braces for entries in an array

curly_swap.php

<?php
function curlySwap($shortcodes,$string) {
	return preg_replace_callback(
		'/\{\{(\w+)\}\}/',
		function ($match) {
			global $shortcodes;
			return $shortcodes[substr($match[0], 2, -2)];
		},
		$string
	);
}

$shortcodes = array(
	'email' => 'jonathancatmull@gmail.com',
	'tel' => '07912 345678'
);

$string = 'My email is {{email}} and telephone {{tel}}.';

echo curlySwap($shortcodes,$string);

// Produces
// My email is jonanthancatmull@gmail.com and telephone 07912 345678.
?>

Awesome function!