smarty/plugins/shared.escape_special_chars.php

<?php
/**
 * Smarty shared plugin
 *
 * @package    Smarty
 * @subpackage PluginsShared
 */
/**
 * escape_special_chars common function
 * Function: smarty_function_escape_special_chars
 * Purpose:  used by other smarty functions to escape
 *           special chars except for already escaped ones
 *
 * @author Monte Ohrt <monte at ohrt dot com>
 *
 * @param string $string text that should by escaped
 *
 * @return string
 */
function smarty_function_escape_special_chars($string)
{
    if (!is_array($string)) {
        $string = htmlspecialchars($string, ENT_COMPAT, \Smarty\Smarty::$_CHARSET, false);
    }
    return $string;
}