字符编码自动转换

func.php

<?php

/**
 * 支持对多维数组，对象，... 进行编码转换
 * 在不指定来源编码时，由系统自动检测编码类型
 *
 * @link   http://cn2.php.net/manual/zh/function.mb-detect-encoding.php
 * @link   http://cn2.php.net/manual/zh/function.mb-detect-order.php
 * @param  mixed  $data          需要转换的数据
 * @param  string $to_encoding   目标编码类型
 * @param  string $from_encoding 来源编码类型，默认自动检测类型
 * @param  mixed  $encoding_list 编码检测类型及顺序
 * @return mixed
 */
function to_encoding($data, $to_encoding, $from_encoding = null,
    $encoding_list = 'UTF-8,GBK,CP936,ISO-8859-1,ASCII')
{
    if (is_string($data)) {
        if ($from_encoding === null) {
            $from_encoding = mb_detect_encoding($data, $encoding_list);
        }

        if (strtoupper($to_encoding) !== strtoupper($from_encoding)) {
            $data = mb_convert_encoding($data, $to_encoding, $from_encoding);
        }

    } elseif (is_array($data) || is_object($data)) {
        foreach ($data as $key => & $val) {
            $val = call_user_func_array(__FUNCTION__, array($val, $to_encoding, $from_encoding));
        }
    }

    return $data;
}