Enclose.php

<?php

public static function Enclose($string, $delimiter = null)
{
	if (strlen($string = trim($string)) > 0)
	{
		$string = sprintf('%2$s%1$s%2$s', trim($string, $delimiter), $delimiter);
	}

	return $string;
}

Is the sprintf to protect against float/int/booleans being cast incorrectly from something like this?

$string = $string ? $delimiter . $string . $delimiter : '';

@xeoncross: No, not really - I'm just used to sprintf. That's a nice minification BTW. ;)