遗留C＃到PHP

Question

I have recently taken over a legacy service and I'm in the process of converting it to PHP, however I have gotten stuck with the more intricate functionality of C#.

From what I see the request message length needs to be packed and then concatted with the actual message before being sent to the service.

string strReceiveBuffer;
string msg1 = string.Empty;
msg1 = msg1 + txtRqst.Text;
Int64 intMessageLength = msg1.Length;
byte byt1; byte byt2;

//The below should work assuming a 16 bit register.
byt1 = Convert.ToByte(decimal.Truncate(intMessageLength/ 256));
byt2 = Convert.ToByte(decimal.Remainder(intMessageLength, 256));
string strLength = string.Empty;
strLength = strLength 
    + Microsoft.VisualBasic.Strings.Chr(byt1).ToString() 
    + Microsoft.VisualBasic.Strings.Chr(byt2).ToString();

//Only encode the length using BigEndianCode, the message content is encoded using UTF8
byte[] byteData = Encoding.BigEndianUnicode.GetBytes(strLength)
    .Concat(Encoding.UTF8.GetBytes(msg1)).ToArray();

Is anybody able to help with the above code before I tear my hair out?

Answer 1

To anybody that has to convert C# to PHP, good luck. After struggling with variations of encoding and decoding I finally managed to translate it to PHP.

function convertRequest($msg) {
    $length = strlen($msg);
    $byt1 = intval($length / 256);
    $byt2 = $length % 256;
    $strLength = mb_convert_encoding((string) chr($byt1) . (string) chr($byt2), 'UTF-16BE');
    $msg = mb_convert_encoding($msg, 'UTF-8');
    $data = $strLength . $msg;
    return $data;
}