https://jackxiang.com/index.php zh-cn https://jackxiang.com/post// jack <xdy108@126.com> Thu, 26 Nov 2009 16:32:48 +0000 https://jackxiang.com/post// pack()将数据打包成二进制串
unpack()从字串中的二进制串转化成指定的格式
Code Description
a NUL-padded string
A SPACE-padded string
h Hex string, low nibble first
H Hex string, high nibble first
c signed char
C unsigned char
s signed short (always 16 bit, machine byte order)
S unsigned short (always 16 bit, machine byte order)
n unsigned short (always 16 bit, big endian byte order)
v unsigned short (always 16 bit, little endian byte order)
i signed integer (machine dependent size and byte order)
I unsigned integer (machine dependent size and byte order)
l signed long (always 32 bit, machine byte order)
L unsigned long (always 32 bit, machine byte order)
N unsigned long (always 32 bit, big endian byte order)
V unsigned long (always 32 bit, little endian byte order)
f float (machine dependent size and representation)
d double (machine dependent size and representation)
x NUL byte
X Back up one byte
@ NUL-fill to absolute position
例如,
typedef struct _BorrowInfo
{
char mobile[32];
char area[8];
int   type;
int   ret
} BorrowInfo

<?
//将PHP变量转成结构
$type=100;
$mobile="13901234567";
$ret=0;
$area="BJ";
$returnstr=sprintf("%-32s,$mobile).sprintf("%-8s,$area).pack("l",$type).pack("l",$ret);
//将结构转成php变量
//对于字符型变量可以直接取得
$moible=substr($returnstr,0,32);
$area=substr($returnstr,32,8);

$fuckarray=unpack("nint",substr($returnstr,40,4));
$type=$fuckarray['int'];
//RET变量也可以向type类似取得

?>
需要注意的事,C语言结构由于内存对齐方式和机器字节顺序问题,需要对代码进行微调,才能正常使用.
比如将结构体构体的手机号设为25位,则整个结构sizeof后是44字节,而不是41字节,切记.否则用PHP转成的结构C语言是解析不了的.

------------------------------------------------

/*server.c*/
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

main(){
     int sock;
     struct sockaddr_in server,client;
     int recvd,snd;
     int structlength;
     char * server_ip = "128.168.10.1";/*server ip address*/
     int port = 8888;
     char recvbuf[2000],sendbuf[2000];    

     char str1[]="I have received:\n";

     memset((char *)&server,0,sizeof(server));
     server.sin_family = AF_INET;
     server.sin_addr.s_addr = inet_addr(server_ip);
     server.sin_port = htons(port);


     memset((char *)&client,0,sizeof(client));
     client.sin_family = AF_INET;
     client.sin_addr.s_addr = htonl(INADDR_ANY);
     client.sin_port = htons(port);
    

     if((sock = socket (AF_INET,SOCK_DGRAM,0)) < 0 ){
         printf("socket create error!\n");
         exit(1);
     }

    
     structlength = sizeof(server);
     if( bind(sock,(struct sockaddr *) &server,structlength) < 0){
         printf("socket bind error!\n");
         perror("bind");
         exit(1);
     }

     while(1){
         structlength = sizeof(client);    
            
         printf("waiting.......\n");
         recvd = recvfrom(sock,recvbuf,sizeof(recvbuf),0,
             (struct sockaddr *) & client,&structlength);
         if(recvd < 0){
             perror("recvfrom");
             exit(EXIT_FAILURE);    
         }
         else{
             printf("received:%s\n",recvbuf);
        
             memset(sendbuf,0,strlen(sendbuf));
             memcpy(sendbuf,str1,strlen(str1));
                    
             snd = sendto(sock,sendbuf,strlen(str1),0,
             (struct sockaddr *) &client,structlength);

             if(snd < 0){
             perror("sendto");
             exit(1);
             }
             printf("sendok!\n");

         }
        
        
     }    
        
     close(sock);
}
/*
gcc -o server server.c生成server程序，在服务器端运行./server
*/


/*client.php*/

<?php
$server_ip="128.168.10.1";
$port = 8888;

$sock=@socket_create(AF_INET,SOCK_DGRAM,0);

if(!$sock){

     echo "socket create failure";

}

if($buf=="")

     $buf="hello,how are you!\n";

if(!@socket_sendto($sock,$buf,strlen($buf),0,"128.168.10.1",8888)){

     echo "send error\n";

     socket_close($sock);

     exit();

}



$buf="";
$msg="";

if(!@socket_recvfrom($sock,$msg,256,0,&$server_ip,&$port)){

     echo "recvieve error!";

     socket_close($sock);

     exit();

}

echo trim($msg)."\n";

socket_close($sock);

?>
<form action="client.php" method="post">
<input type=text name=buf>
<input type=submit value="submit">
</form>

/*这个过程很简单，就是客户端提交一个信息，服务端接收，
并返回给客户端一个"接收到"的确认信息。
*/

--------------------------------------------------------

<?
// 设置一些基本的变量
$host = "192.168.1.99";
$port = 1234;
// 设置超时时间
set_time_limit(0);
// 创建一个Socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create
socket\n");
//绑定Socket到端口
$result = socket_bind($socket, $host, $port) or die("Could not bind to
socket\n");
// 开始监听链接
$result = socket_listen($socket, 3) or die("Could not set up socket
listener\n");
// accept incoming connections
// 另一个Socket来处理通信
$spawn = socket_accept($socket) or die("Could not accept incoming
connection\n");
// 获得客户端的输入
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// 清空输入字符串
$input = trim($input);
//处理客户端输入并返回结果
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write
output\n");
// 关闭sockets
socket_close($spawn);
socket_close($socket);
?>

--------------------------------------

socket_accept() 接受一个Socket连接
socket_bind() 把socket绑定在一个IP地址和端口上
socket_clear_error() 清除socket的错误或者最后的错误代码
socket_close() 关闭一个socket资源
socket_connect() 开始一个socket连接
socket_create_listen() 在指定端口打开一个socket监听
socket_create_pair() 产生一对没有区别的socket到一个数组里
socket_create() 产生一个socket，相当于产生一个socket的数据结构
socket_get_option() 获取socket选项
socket_getpeername() 获取远程类似主机的ip地址
socket_getsockname() 获取本地socket的ip地址
socket_iovec_add() 添加一个新的向量到一个分散/聚合的数组
socket_iovec_alloc() 这个函数创建一个能够发送接收读写的iovec数据结构
socket_iovec_delete() 删除一个已经分配的iovec
socket_iovec_fetch() 返回指定的iovec资源的数据
socket_iovec_free() 释放一个iovec资源
socket_iovec_set() 设置iovec的数据新值
socket_last_error() 获取当前socket的最后错误代码
socket_listen() 监听由指定socket的所有连接
socket_read() 读取指定长度的数据
socket_readv() 读取从分散/聚合数组过来的数据
socket_recv() 从socket里结束数据到缓存
socket_recvfrom() 接受数据从指定的socket，如果没有指定则默认当前socket
socket_recvmsg() 从iovec里接受消息
socket_select() 多路选择
socket_send() 这个函数发送数据到已连接的socket
socket_sendmsg() 发送消息到socket
socket_sendto() 发送消息到指定地址的socket
socket_set_block() 在socket里设置为块模式
socket_set_nonblock() socket里设置为非块模式
socket_set_option() 设置socket选项
socket_shutdown() 这个函数允许你关闭读、写、或者指定的socket
socket_strerror() 返回指定错误号的详细错误
socket_write() 写数据到socket缓存
socket_writev() 写数据到分散/聚合数组


PHP socket 编程中的超时设置，网上找了半天也没找到，贴出来分享之。

设置$socket 发送超时1秒，接收超时3秒：

$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,array("sec"=>1, "usec"=>0 ) );
socket_set_option($socket,SOL_SOCKET,SO_SNDTIMEO,array("sec"=>3, "usec"=>0 ) );

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