<?php

/**

 * Smarty plugin

 *

 * @package    Smarty

 * @subpackage PluginsModifier

 */

/**

 * Smarty regex_replace modifier plugin

 * Type:     modifier<br>

 * Name:     regex_replace<br>

 * Purpose:  regular expression search/replace

 *

 * @link    http://smarty.php.net/manual/en/language.modifier.regex.replace.php

 *          regex_replace (Smarty online manual)

 * @author  Monte Ohrt <monte at ohrt dot com>

 *

 * @param string $string input string

 * @param string|array $search regular expression(s) to search for

 * @param string|array $replace string(s) that should be replaced

 *

 * @return string

 */

function smarty_modifier_regex_replace($string, $search, $replace) {

    if (is_array($search)) {

        foreach ($search as $idx => $s) {

            $search[$idx] = _smarty_regex_replace_check($s);

        }

    } else {

        $search = _smarty_regex_replace_check($search);

    }

    return preg_replace($search, $replace, $string);

}

/**

 * @param  string $search string(s) that should be replaced

 *

 * @return string

 * @ignore

 */

function _smarty_regex_replace_check($search) {

    // null-byte injection detection

    // anything behind the first null-byte is ignored

    if (($pos = strpos($search, "\0")) !== false) {

        $search = substr($search, 0, $pos);

    }

    // remove eval-modifier from $search

    if (preg_match('!([a-zA-Z\s]+)$!s', $search, $match) && (strpos($match[1], 'e') !== false)) {

        $search = substr($search, 0, -strlen($match[1])) . preg_replace('![e\s]+!', '', $match[1]);

    }

    return $search;

}