How to create websockets server in PHP

Question

I am looking for a simple code to create a WebSocket server  I found phpwebsockets but it is outdated now and doesn t support the newest protocol  I tried updating it myself but it doesn t seem to work     php -q  lt  php       gt php -q server php      error reporting E ALL   set time limit 0   ob implicit flush      master    WebSocket  quot localhost quot  12345    sockets   array  master    users     array     debug     false   while true      changed    sockets    socket select  changed  write NULL  except NULL NULL     foreach  changed as  socket       if  socket   master          client socket accept  master         if  client lt 0   console  quot socket accept   failed quot    continue          else  connect  client               else         bytes    socket recv  socket  buffer 2048 0         if  bytes  0   disconnect  socket           else           user   getuserbysocket  socket           if   user- gt handshake   dohandshake  user  buffer             else  process  user  buffer                            --------------------------------------------------------------- function process  user  msg      action   unwrap  msg     say  quot  lt   quot   action     switch  action       case  quot hello quot    send  user- gt socket  quot hello human quot                          break      case  quot hi quot       send  user- gt socket  quot zup human quot                            break      case  quot name quot     send  user- gt socket  quot my name is Multivac  silly I know quot    break      case  quot age quot      send  user- gt socket  quot I am older than time itself quot          break      case  quot date quot     send  user- gt socket  quot today is  quot  date  quot Y m d quot               break      case  quot time quot     send  user- gt socket  quot server time is  quot  date  quot H i s quot         break      case  quot thanks quot   send  user- gt socket  quot you re welcome quot                       break      case  quot bye quot      send  user- gt socket  quot bye quot                                  break      default        send  user- gt socket  action  quot  not understood quot              break         function send  client  msg     say  quot  gt   quot   msg      msg   wrap  msg     socket write  client  msg strlen  msg       function WebSocket  address  port      master socket create AF INET  SOCK STREAM  SOL TCP      or die  quot socket create   failed quot      socket set option  master  SOL SOCKET  SO REUSEADDR  1   or die  quot socket option   failed quot      socket bind  master   address   port                     or die  quot socket bind   failed quot      socket listen  master 20                                 or die  quot socket listen   failed quot      echo  quot Server Started    quot  date  Y-m-d H i s    quot  n quot     echo  quot Master socket     quot   master  quot  n quot     echo  quot Listening on      quot   address  quot  port  quot   port  quot  n n quot     return  master     function connect  socket     global  sockets  users     user   new User       user- gt id   uniqid       user- gt socket    socket    array push  users  user     array push  sockets  socket     console  socket  quot  CONNECTED  quot       function disconnect  socket     global  sockets  users     found null     n count  users     for  i 0  i lt  n  i         if  users  i - gt socket   socket    found  i  break          if  is null  found    array splice  users  found 1        index   array search  socket  sockets     socket close  socket     console  socket  quot  DISCONNECTED  quot      if  index gt  0   array splice  sockets  index 1        function dohandshake  user  buffer     console  quot  nRequesting handshake    quot      console  buffer       list  resource  host  origin  strkey1  strkey2  data     list  resource  host  u  c  key  protocol  version  origin  data    getheaders  buffer     console  quot Handshaking    quot          acceptkey   base64 encode sha1  key    quot 258EAFA5-E914-47DA-95CA-C5AB0DC85B11 quot  true       upgrade     quot HTTP 1 1 101 Switching Protocols r nUpgrade  websocket r nConnection  Upgrade r nSec-WebSocket-Accept   acceptkey r n quot      socket write  user- gt socket  upgrade strlen  upgrade       user- gt handshake true    console  upgrade     console  quot Done handshaking    quot      return true     function getheaders  req        r  h  u  c  key  protocol  version  o  data null      if preg match  quot  GET      HTTP  quot      req  match     r  match 1         if preg match  quot  Host       r n  quot     req  match     h  match 1         if preg match  quot  Upgrade       r n  quot   req  match     u  match 1         if preg match  quot  Connection       r n  quot   req  match     c  match 1         if preg match  quot  Sec-WebSocket-Key       r n  quot   req  match     key  match 1         if preg match  quot  Sec-WebSocket-Protocol       r n  quot   req  match     protocol  match 1         if preg match  quot  Sec-WebSocket-Version       r n  quot   req  match     version  match 1         if preg match  quot  Origin       r n  quot   req  match     o  match 1         if preg match  quot   r n         quot   req  match     data  match 1         return array  r  h  u  c  key  protocol  version  o  data      function getuserbysocket  socket     global  users     found null    foreach  users as  user       if  user- gt socket   socket    found  user  break          return  found     function     say  msg  quot  quot    echo  msg  quot  n quot     function    wrap  msg  quot  quot    return chr 0   msg chr 255     function  unwrap  msg  quot  quot    return substr  msg 1 strlen  msg -2     function console  msg  quot  quot    global  debug  if  debug   echo  msg  quot  n quot        class User    var  id    var  socket    var  handshake       gt   and the client  var connection   new WebSocket  ws   localhost 12345    connection onopen   function        connection send  Ping       Send the message  Ping  to the server        Log errors connection onerror   function  error      console log  WebSocket Error     error          Log messages from the server connection onmessage   function  e      console log  Server      e data       If there is anything wrong in my code can you help me fix it  Concole in firefox says  Firefox can t establish a connection to the server at ws   localhost 12345

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As far as I m aware Ratchet is the best PHP WebSocket solution available at the moment  And since it s open source you can see how the author has built this WebSocket solution using PHP

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Need to convert the the key from hex to dec before base64 encoding and then send it for handshake   hashedKey   sha1  key   quot 258EAFA5-E914-47DA-95CA-C5AB0DC85B11 quot  true     rawToken    quot  quot       for   i   0   i  lt  20   i             rawToken    chr hexdec substr  hashedKey  i 2  2            handshakeToken   base64 encode  rawToken     quot  r n quot     handshakeResponse    quot HTTP 1 1 101 Switching Protocols r nUpgrade  websocket r nConnection  Upgrade r nSec-WebSocket-Accept   handshakeToken r n quot

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I ve searched the minimal solution possible to do PHP   WebSockets during hours  until I found this article  Super simple PHP WebSocket example  It doesn t require any third-party library  Here is how to do it  create a index html containing this   lt html gt   lt body gt       lt div id  quot root quot  gt  lt  div gt       lt script gt          var host    ws    lt  lt  lt IP OF YOUR SERVER gt  gt  gt  12345 websockets php           var socket   new WebSocket host           socket onmessage   function e                document getElementById  root   innerHTML   e data                  lt  script gt   lt  body gt   lt  html gt   and open it in the browser  just after you have launched php websockets php in the command-line  yes  it will be an event loop  constantly running PHP script   with this websockets php file

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I was in your shoes for a while and finally ended up using node js  because it can do hybrid solutions like having web and socket server in one  So php backend can submit requests thru http to node web server and then broadcast it with websocket  Very efficiant way to go

User · Answer

I was in the same boat as you recently  and here is what I did   I used the phpwebsockets code as a reference for how to structure the server-side code   You seem to already be doing this  and as you noted  the code doesn t actually work for a variety of reasons    I used PHP net to read the details about every socket function used in the phpwebsockets code  By doing this  I was finally able to understand how the whole system works conceptually  This was a pretty big hurdle   I read the actual WebSocket draft  I had to read this thing a bunch of times before it finally started to sink in  You will likely have to go back to this document again and again throughout the process  as it is the one definitive resource with correct  up-to-date information about the WebSocket API   I coded the proper handshake procedure based on the instructions in the draft in  3  This wasn t too bad   I kept getting a bunch of garbled text sent from the clients to the server after the handshake and I couldn t figure out why until I realized that the data is encoded and must be unmasked  The following link helped me a lot here   original link broken  Archived copy  Please note that the code available at this link has a number of problems and won t work properly without further modification   I then came across the following SO thread  which clearly explains how to properly encode and decode messages being sent back and forth  How can I send and receive WebSocket messages on the server side  This link was really helpful  I recommend consulting it while looking at the WebSocket draft  It ll help make more sense out of what the draft is saying   I was almost done at this point  but had some issues with a WebRTC app I was making using WebSocket  so I ended up asking my own question on SO  which I eventually solved  What is this data at the end of WebRTC candidate info   At this point  I pretty much had it all working  I just had to add some additional logic for handling the closing of connections  and I was done    That process took me about two weeks total  The good news is that I understand WebSocket really well now and I was able to make my own client and server scripts from scratch that work great  Hopefully the culmination of all that information will give you enough guidance and information to code your own WebSocket PHP script  Good luck   Edit  This edit is a couple of years after my original answer  and while I do still have a working solution  it s not really ready for sharing  Luckily  someone else on GitHub has almost identical code to mine  but much cleaner   so I recommend using the following code for a working PHP WebSocket solution  https   github com ghedipunk PHP-Websockets blob master websockets php  Edit  2  While I still enjoy using PHP for a lot of server-side related things  I have to admit that I ve really warmed up to Node js a lot recently  and the main reason is because it s better designed from the ground up to handle WebSocket than PHP  or any other server-side language   As such  I ve found recently that it s a lot easier to set up both Apache PHP and Node js on your server and use Node js for running the WebSocket server and Apache PHP for everything else  And in the case where you re on a shared hosting environment in which you can t install use Node js for WebSocket  you can use a free service like Heroku to set up a Node js WebSocket server and make cross-domain requests to it from your server  Just make sure if you do that to set your WebSocket server up to be able to handle cross-origin requests

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lt  php     server php   server   stream socket server  tcp   127 0 0 1 8001    errno   errorMessage    if  server    false        throw new Exception  Could not bind to socket   errorMessage        for            client    stream socket accept  server        if  client            stream copy to stream  client   client           fclose  client             from one terminal run   php server php  from another terminal run  echo  hello woerld    nc 127 0 0 1 8002

[php] How to create websockets server in PHP

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