gistfile1.php

<?php

  $arrMap = array(1=>17, 34=>98);

	$strBody = '
Nina Gerling said On Thu, Dec 30. 2010
I\'d recomment using the headline like I recommended in ticket #326:
my comment on this, also watch out on #34, but do not convert @#6 but
#1 should be';

	$strBody = preg_replace_callback('/([\n| ])#([0-9]+)/', 'replaceTickets', $strBody);
	
	function replaceTickets($matches)
	{
		global $arrMap;
		
		if (isset($arrMap[$matches[2]]))
		{
			return $matches[1].'#'.$arrMap[$matches[2]];
		}
		else
		{
			return $matches[1].'http://www.contao-forge.org/issues/'.$matches[2];
		}
	}
	
	var_dump($strBody);
?>