The socket communication between PHP and Erlang

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Generally speaking, there are 2 kinds of methods used in network communication: Text communication and binary communication.

Text communication between PHP and Erlang is simpler. There is no discussion here, this paper mainly discusses the implementation of binary communication between PHP and Erlang. The implementation process is as follows:

Erlang-Side code:

-module(server).-export([start/0]).
-define (UINT, /unsigned-little-integer).-define (INT,/signed-little-integer ).-define ( USHORT, /unsigned-little-integer).-define (short,/signed-little-integer ).-define (UBYTE, 8/unsigned-little-integer).-define (BYTE, 8/signed-little-integer).
-define (PORT, 5678).
Percent start service and accept Client Connection 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]), percent will receive the data sent back to the clientgen_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-Side code:

<?php$timeout=3;//Timeout time: 3 seconds$fp= Fsockopen ("tcp://127.0.0.1",5678,$errno,$errstr,$timeout/ * Connection Timeout time * /);if(!$fp) {Echo "$errstr ($errno) <br/>n";}Else{Stream_set_timeout ($fp,$timeout);//Remote data receive or send time-out $format="VVA4";$data= Pack ($format,4,10001,"ABCD");//$data are packaged as binary data in a certain formatFwrite$fp,$data);if(!feof ($fp)) {$rs= Fread ($fp,1024x768);//Read remote Data  if($rs) {$len= Strlen ($rs);//$len can get the length of the data. Used to calculate the length of content   //In this example, the content length is 4   $format="Vlen/vcmd/a4content";$data= Unpack ($format,$rs); Print_r ($data); }Else{Echo "timeout!"; } }Else{Echo "timeout!"; } fclose ($fp);}?
>

Under normal circumstances, the PHP side will display the following content:

Array410001 [content] => abcd )

Some notes for communication:

Here is the PHP pack function and the unpack function:

Pack function: Package data into binary data in a certain format. The resulting data is close to the struct data of C + + + (c + + string terminator).

Unpack function: opposite to pack. Unpack the binary data.

The corresponding Erlang side. It is possible to use bit syntax to match binary data directly.

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The socket communication between PHP and Erlang