<?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_detect_encoding($string, 'UTF-8, ISO-8859-1') === 'UTF-8') {
            // $string has utf-8 encoding
            if (mb_strlen($string) > $length) {
                $length -= min($length, mb_strlen($etc));
                if (!$break_words && !$middle) {
                    $string = preg_replace('/\s+?(\S+)?$/u', '', mb_substr($string, 0, $length + 1));
                } 
                if (!$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;
            } 
        } 
    } 
    // $string has no utf-8 encoding
    if (strlen($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;
    } 
} 

*/

function smarty_modifier_truncate($string,$sublen,$start=0,$code='UTF-8'){
	$code = strtolower($code);
	if($code == 'utf-8' || $code == 'utf8'){
		$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; 
		preg_match_all($pa, $string, $t_string); 
		if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen)).""; return join('', array_slice($t_string[0], $start, $sublen));
	}else{ 
		$start = $start*2; 
		$sublen = $sublen*2; 
		$strlen = strlen($string); 
		$tmpstr = ''; 
		for($i=0; $i< $strlen; $i++){ 
			if($i>=$start && $i< ($start+$sublen)){
				if(ord(substr($string, $i, 1))>129){
					$tmpstr.= substr($string, $i, 2);
				}else{
					$tmpstr.= substr($string, $i, 1);
				} 
			}
			if(ord(substr($string, $i, 1))>129) $i++;
		}
		//if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
		return $tmpstr;
	}
}
?>