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Converting C# BitConverter.GetBytes() to PHP – Php versions

I’m trying to port this C# code to PHP:

var headerList = new List<byte>();

headerList.AddRange(Encoding.ASCII.GetBytes("Hellon"));
headerList.AddRange(BitConverter.GetBytes(1));

byte[] header = headerList.ToArray();

If I output header, what does it looks like?

My progress so far:

    $in_raw = "Hellon";
    
    for($i = 0; $i < mb_strlen($in_raw, 'ASCII'); $i++){
      $in.= ord($in_raw[$i]);
    }
    
    $k=1;
    $byteK=array(8); // should be 16? 32?...
    for ($i = 0; $i < 8; $i++){
        $byteK[$i] = (( $k >> (8 * $i)) & 0xFF); // Don't known if it is a valid PHP bitwise op
    }
    
    $in.=implode($byteK);

    print_r($in);

Which gives me this output: 721011081081111010000000

I’m pretty confident that the first part of converting the string to ASCII bytes is correct, but these BitConverter… I don’t know what to expect as output…

This string (or byte array) is used as an handshake for an socket connection. I know that the C# version does work, but my refurnished code doesn’t.

Tags:

3

Answers


  1. 0

    Encoding.ASCII.GetBytes(“Hellon”).ToArray()
    gives byte[6] { 72, 101, 108, 108, 111, 10 }

    BitConverter.GetBytes((Int64)1).ToArray()
    gives byte[8] { 1, 0, 0, 0, 0, 0, 0, 0 }

    BitConverter.GetBytes((Int32)1).ToArray()
    byte[4] { 1, 0, 0, 0 }

    the last one is default compiler conversion of 1.

    if PHP code please try $byteK=array(4); and $i < 4

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  2. 0

    The string “Hellon” is already encoded in ASCII so you have nothing to do.

    BitConverter.GetBytes() gives the binary representation of a 32-bit integer in machine byte order, which can be done in PHP with the pack() function and the l format.

    So the PHP code is simply:

    $in = "Hellon";
$in .= pack('l', 1);
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  3. 0

    If you don’t have access to a machine/tool that can run C#, there are a couple of REPL websites that you can use. I’ve taken your code, qualified a couple of the namespaces (just for convenience), wrapped it in a main() method to just run once as a CLI and put it here. It also includes a for loop that writes the contents of the array out so that you can see what is at each index.

    Here’s the same code for reference:

    using System;

class MainClass {
  public static void Main (string[] args) {
    var headerList = new System.Collections.Generic.List<byte>();

    headerList.AddRange(System.Text.Encoding.ASCII.GetBytes("Hellon"));
    headerList.AddRange(System.BitConverter.GetBytes(1));

    byte[] header = headerList.ToArray();

    foreach(byte b in header){
      Console.WriteLine(b);
    }
  }
}

    When you run this code, the following output is generated:

    72
101
108
108
111
10
1
0
0
0
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