<?php

set_time_limit(0);  

$host = "127.0.0.1";

$port = 3046;

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)or die("Could not create  socket\n");  

$connection = socket_connect($socket, $host, $port) or die("Could not connet server\n");

socket_write($socket, "hello socket") or die("Write failed\n");

while ($buff = socket_read($socket, 1024, PHP_NORMAL_READ)) {

    echo("Response was:" . $buff . "\n");

	echo("input what you want to say to the server:\n");

	$text = fgets(STDIN);

	socket_write($socket, $text);

}

socket_close($socket);

?>

<?php 

//确保在连接客户端时不会超时
set_time_limit(0);
//设置IP和端口号
$address = "127.0.0.1";
$port = 3046;
/**
* 创建一个SOCKET
* AF_INET=是ipv4 如果用ipv6，则参数为 AF_INET6
* SOCK_STREAM为socket的tcp类型，如果是UDP则使用SOCK_DGRAM
*/
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() fail:" . socket_strerror(socket_last_error()) . "/n");
//阻塞模式
socket_set_block($sock) or die("socket_set_block() fail:" . socket_strerror(socket_last_error()) . "/n");
//绑定到socket端口
$result = socket_bind($sock, $address, $port) or die("socket_bind() fail:" . socket_strerror(socket_last_error()) . "/n");
//开始监听
$result = socket_listen($sock, 4) or die("socket_listen() fail:" . socket_strerror(socket_last_error()) . "/n");
echo "OK\nBinding the socket on $address:$port ... ";
echo "OK\nNow ready to accept connections.\nListening on the socket ... \n";
do { // never stop the daemon
//它接收连接请求并调用一个子连接Socket来处理客户端和服务器间的信息
$msgsock = socket_accept($sock) or die("socket_accept() failed: reason: " . socket_strerror(socket_last_error()) . "/n");
while(1){
//读取客户端数据
echo "Read client data \n";
//socket_read函数会一直读取客户端数据,直到遇见\n,\t或者\0字符.PHP脚本把这写字符看做是输入的结束符.
$buf = socket_read($msgsock, 8192);
echo "Received msg: $buf \n";

if($buf == "bye"){
//接收到结束消息，关闭连接，等待下一个连接
socket_close($msgsock);
continue;
}

//数据传送 向客户端写入返回结果
$msg = "welcome \n";
socket_write($msgsock, $msg, strlen($msg)) or die("socket_write() failed: reason: " . socket_strerror(socket_last_error()) ."/n");
}

} while (true);
socket_close($sock);
?>