title: Receive UDP packet datagrams in PHP
body: <p>I am working in php to build a listening server for a GPS tracking system. The GPS sends data through UDP packets, which I can display by running the below script. However the actual data comes out in symbols so I am guessing I am missing a conversion</p>
  
  <pre><code>    //Reduce errors
      error_reporting(~E_WARNING);
  
      //Create a UDP socket
      if(!($sock = socket_create(AF_INET, SOCK_DGRAM, 0)))
      {
          $errorcode = socket_last_error();
          $errormsg = socket_strerror($errorcode);
  
          die("Couldn't create socket: [$errorcode] $errormsg \n");
      }
  
      echo "Socket created \n";
  
      // Bind the source address
      if( !socket_bind($sock, "192.168.1.29" , 1731) )
      {
          $errorcode = socket_last_error();
          $errormsg = socket_strerror($errorcode);
  
          die("Could not bind socket : [$errorcode] $errormsg \n");
      }
  
      echo "Socket bind OK \n";
  
      //Do some communication, this loop can handle multiple clients
      while(1)
      {
          echo "\n Waiting for data ... \n";
  
          //Receive some data
          $r = socket_recvfrom($sock, $buf, 512, 0, $remote_ip, $remote_port);
          echo "$remote_ip : $remote_port -- " . $buf;
  
              //Send back the data to the client
          //socket_sendto($sock, "OK " . $buf , 100 , 0 , $remote_ip , $remote_port);
  
      }
  
      socket_close($sock);
  </code></pre>