php转换字符编码

/**

     * 判断并转换字符编码，需 mb_string 模块支持。

     *

     * @param mixed $str

     *            数据

     * @param string $encoding

     *            要转换的编码类型

     * @return mixed 转换过的数据

     */

    public function encoding_convert($str, $encoding = 'UTF-8')

    {

        if (is_array($str)) {

            $arr = array();

            foreach ($str as $key => $val) {

                $arr[$key] = self::encoding_convert($val, $encoding);

            }

            return $arr;

        }

        $_encoding = mb_detect_encoding($str, array(

            'ASCII',

            'UTF-8',

            'GB2312',

            'GBK',

            'BIG5'

        ));

        if ($_encoding == $encoding) {

            return $str;

        }

        try {

            $str = @mb_convert_encoding($str, $encoding, $_encoding);

        } catch (Exception $e) {

            // nothing todo

        }

        return $str;

    }