Convert JAVA method to the same functionality in PHP

Question

Because I only know PHP language, I can’t understand a Java method, and I don’t know how to implement it with PHP. Could you please give me some advice:
java source code is as follows:

    MessageDigest md5 = MessageDigest.getInstance("MD5");
        BASE64Encoder base64en = new BASE64Encoder();
        // 加密后的字符串
        String newstr = base64en.encode(md5.digest(str.getBytes("utf-8")));

How to implement the above method using PHP?

Answer 1

$newstr = base64_encode(md5($str,true));

Answer 2

$newstr = base64_encode(md5(mb_convert_encoding($str,'utf-8')))