154.php array to utf8

function convertToUtf8($value, $sourceEncoding){    if(is_string($value))        $value = mb_convert_encoding($value,'UTF-8',$sourceEncoding);    else if (is_array($value))    {        foreach($value as &$element)            convertToUtf8($element, $sourceEncoding);    }     return $value;}$arr = array('爱我中华');$a = convertToUtf8($arr,'gbk');var_dump($a);