smarty/libs/plugins/modifier.replace.php

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

/**
 * Smarty replace modifier plugin
 * Type:     modifier
 * Name:     replace
 * Purpose:  simple search/replace
 *
 * @link   http://smarty.php.net/manual/en/language.modifier.replace.php replace (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 * @author Uwe Tews
 *
 * @param string $string  input string
 * @param string $search  text to search for
 * @param string $replace replacement text
 *
 * @return string
 */
function smarty_modifier_replace($string, $search, $replace)
{
    static $is_loaded = false;
    if (Smarty::$_MBSTRING) {
        if (!$is_loaded) {
            if (!is_callable('smarty_mb_str_replace')) {
                require_once(SMARTY_PLUGINS_DIR . 'shared.mb_str_replace.php');
            }
            $is_loaded = true;
        }
         return smarty_mb_str_replace($search, $replace, $string);
    }

    return str_replace($search, $replace, $string);
}