php实现与erlang的二进制通讯实例解析

-module(server).
-export([start/0]).

-define( UINT, 32/unsigned-little-integer).
-define( INT, 32/signed-little-integer).
-define( USHORT, 16/unsigned-little-integer).
-define( SHORT, 16/signed-little-integer).
-define( UBYTE, 8/unsigned-little-integer).
-define( BYTE, 8/signed-little-integer).

-define( PORT, 5678).

%% 启动服务并接受客户端的连接
start() ->
{ok, LSock} = gen_tcp:listen(?PORT, [binary, {packet, 0},{active, false}]),
io:format("socket listen: ~p on ~p ~n",[LSock, ?PORT]),
accept(LSock).

accept(LSock) ->
{ok, ASock} = gen_tcp:accept(LSock),
spawn(fun() -> server_loop(ASock) end),
accept(LSock).

server_loop(ASock) ->
case gen_tcp:recv(ASock, 0) of
{ok, <<Len:?USHORT,Cmd:?USHORT,Contain:4/binary-unit:8>> = A} ->
io:format("recv data: ~p ~p ~p~n", [Len, Cmd, Contain]),
%%将接收到数据发送回客户端
gen_tcp:send(ASock, A),
server_loop(ASock);
{ok, Data} ->
io:format("recv unformated data: ~p~n", [Data]),
server_loop(ASock);
{error, _} ->
{ok, recv_error}
end.

php端代码：