tạo plugin convert tiếng Việt thành không dấu trong smarty

Tạo một file php nội dung như  sau:

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

/** * Smarty unicode_convert language Vietnamese modifier plugin
* bang.webdeveloper@gmail.com
*
* @param string $str
* @return string
*/

function unicode_convert($str){
if(!$str) return false;
$str = trim($str);
$unicode = array(
 ‘a’=>array(‘á’,’à’,’ả’,’ã’,’ạ’,’ă’,’ắ’,’ặ’,’ằ’,’ẳ’,’ẵ’,’â’,’ấ’,’ầ’,’ẩ’,’ẫ’,’ậ’),
 ‘A’=>array(‘Á’,’À’,’Ả’,’Ã’,’Ạ’,’Ă’,’Ắ’,’Ặ’,’Ằ’,’Ẳ’,’Ẵ’,’Â’,’Ấ’,’Ầ’,’Ẩ’,’Ẫ’,’Ậ’),
 ‘d’=>array(‘đ’),
 ‘D’=>array(‘Đ’),
 ‘e’=>array(‘é’,’è’,’ẻ’,’ẽ’,’ẹ’,’ê’,’ế’,’ề’,’ể’,’ễ’,’ệ’),
 ‘E’=>array(‘É’,’È’,’Ẻ’,’Ẽ’,’Ẹ’,’Ê’,’Ế’,’Ề’,’Ể’,’Ễ’,’Ệ’),
 ‘i’=>array(‘í’,’ì’,’ỉ’,’ĩ’,’ị’),
 ‘I’=>array(‘Í’,’Ì’,’Ỉ’,’Ĩ’,’Ị’),
 ‘o’=>array(‘ó’,’ò’,’ỏ’,’õ’,’ọ’,’ô’,’ố’,’ồ’,’ổ’,’ỗ’,’ộ’,’ơ’,’ớ’,’ờ’,’ở’,’ỡ’,’ợ’),
 ‘0’=>array(‘Ó’,’Ò’,’Ỏ’,’Õ’,’Ọ’,’Ô’,’Ố’,’Ồ’,’Ổ’,’Ỗ’,’Ộ’,’Ơ’,’Ớ’,’Ờ’,’Ở’,’Ỡ’,’Ợ’),
 ‘u’=>array(‘ú’,’ù’,’ủ’,’ũ’,’ụ’,’ư’,’ứ’,’ừ’,’ử’,’ữ’,’ự’),
 ‘U’=>array(‘Ú’,’Ù’,’Ủ’,’Ũ’,’Ụ’,’Ư’,’Ứ’,’Ừ’,’Ử’,’Ữ’,’Ự’),
 ‘y’=>array(‘ý’,’ỳ’,’ỷ’,’ỹ’,’ỵ’),
 ‘Y’=>array(‘Ý’,’Ỳ’,’Ỷ’,’Ỹ’,’Ỵ’),
 ‘-‘=>array(‘ ‘,’.’,’.’,’/’),
 ‘ ‘=>array(‘(‘,’)’,’>’,
 ‘<‘,’!’,’?’,’%’,’“’,’”’,'”‘,”‘”,’,’)
 );

foreach($unicode as $nonUnicode=>$uni){
  foreach($uni as $value) $str = str_replace($value,$nonUnicode,$str);
}
$str = str_replace(“–“,”-“,$str);
$str = str_replace(” “,””,$str);
$str = ucfirst(strtolower($str));
return $str;
}

Lưu lại nội dung trên vào thư mục với tên như sau:
Smarty-2.6/libs/plugins/modifier.unicode_convert.php
<?php $this->tsmarty->assign(‘title’, “sản phẩm”); ?>
Gọi hàm trên trong template engineen xtpl, tpl,… như sau:
{$title|unicode_convert} //output san-pham