php將字符串轉為二進制數據串

/**
    * 將字符串轉換成二進制
    * @param type $str
    * @return type
    */
    function StrToBin($str){
        //1.列出每個字符
        $arr = preg_split('/(?<!^)(?!$)/u', $str);
        //2.unpack字符
        foreach($arr as &$v){
            $temp = unpack('H*', $v);
            $v = base_convert($temp[1], 16, 2);
            unset($temp);
        }

        return join(' ',$arr);
    }

    /**
    * 將二進制轉換成字符串
    * @param type $str
    * @return type
    */
    function BinToStr($str){
        $arr = explode(' ', $str);
        foreach($arr as &$v){
            $v = pack("H".strlen(base_convert($v, 2, 16)), base_convert($v, 2, 16));
        }
        return join('', $arr);
    }