PHP socket实现 readInt 和 readString 以及和Java端对接

java:

DataOutputStream out = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
out.writeInt("REWQTY".getBytes().length);
out.write("REWQTY".getBytes());
out.close();//php端是阻塞的，除非close

php:

function readInt($sock)
   $buf = socket_read($sock,4);
   if ($buf){
       return unpack('N',$buf)[1];
   }else{
       throw new Exception();
   }
}

function readString($socket)
  $n = readInt($socket);
  return socket_read($socket, $n);
}

echo readString($sock,$l);
echo "\n";