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File: modifier.truncate.php
<?php
// (c) Copyright 2002-2011 by authors of the Tiki Wiki CMS Groupware Project
// 
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: modifier.truncate.php 34245 2011-05-04 17:24:47Z sylvieg $

/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */

/**
 * Smarty truncate modifier plugin
 *
 * Type:     modifier<br>
 * Name:     truncate<br>
 * Purpose:  Truncate a string to a certain length if necessary,
 *           optionally splitting in the middle of a word, and
 *           appending the $etc string or inserting $etc into the middle.
 * @link http://smarty.php.net/manual/en/language.modifier.truncate.php
 *          truncate (Smarty online manual)
 * @author   Monte Ohrt <monte at ohrt dot com>
 * @param string
 * @param integer
 * @param string
 * @param boolean
 * @param boolean
 * @return string
 */
function smarty_modifier_truncate($string, $length = 80, $etc = '...',
                                  $break_words = false, $middle = false)
{
    if ($length == 0)
        return '';

    $strlength = (function_exists('mb_strlen') ? 'mb_strlen' : 'strlen');
    if ($strlength($string) > $length) {
        $length -= min($length, strlen($etc));
		if (function_exists('mb_substr'))
			$func = 'mb_substr';
		else
			$func = 'substr';
        if (!$break_words && !$middle) {
            $string = preg_replace('/\s+?(\S+)?$/', '', $func($string, 0, $length+1));
        }
        if(!$middle) {
            return $func($string, 0, $length) . $etc;
        } else {
            return $func($string, 0, $length/2) . $etc . $func($string, -$length/2);
        }
    } else {
        return $string;
    }
}