modifier.truncate.php

<?php
/**
* Smarty plugin
* 
* @package Smarty
* @subpackage PluginsModifier
*/

/**
* 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 $string input string
* @param integer $length lenght of truncated text
* @param string $etc end string
* @param boolean $break_words truncate at word boundary
* @param boolean $middle truncate in the middle of text
* @return string truncated string
*/
function smarty_modifier_truncate($string, $length = 80, $etc = '...',
    $break_words = false, $middle = false)
{
    if ($length == 0)
        return '';

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

?>