简单的php socket 实例

server：

 <?php
 set_time_limit(0);

 $ip = '127.0.0.1';
 $port = 8888;

 // 1. 创建
 if( ($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) == FALSE ){
     echo 'create fail：' . socket_strerror(socket_last_error());
 }

 // 2. 绑定
 if ( socket_bind($sock, $ip, $port) == FALSE ) {
     echo 'bind fail：' . socket_strerror(socket_last_error());
 }

 // 3. 监听
 if( socket_listen($sock, 4) == FALSE ){
     echo 'listen fail：' . socket_strerror(socket_last_error());
 }

 $count = 0;

 do{
     // 4. 阻塞，等待客户端请求
     if ( ($msgsock = socket_accept($sock)) == FALSE ) {

         echo 'accept fail：' . socket_strerror(socket_last_error());

         break;
     } else {

         // 5. 向客户端写入信息
         $msg = 'server send successfully!';
         socket_write($msgsock, $msg, strlen($msg));

         // 5. 读取客户端信息
         echo '-----test successfully!------';
         $buf = socket_read($msgsock, 8192);

         $talkback = 'receive client: ' . $buf;
         echo $talkback;

         if ($count >= 5) {
             break;
         }
     }

     // 6. 关闭socket
     socket_close($msgsock);

 }while(true);

 // 6. 关闭socket
 socket_close($sock);

client：

<?php
error_reporting(E_ALL);
set_time_limit(0);

$ip = '127.0.0.1';
$port = 8888;

// 1. 创建
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

if( $socket == FALSE ) {
    echo 'create fail: ' . socket_strerror(socket_last_error());
} else {
    echo 'OK';
}

// 2. 链接
echo 'we will try to connect ' . $ip .':' . $port . '\r\n----';
$result = socket_connect($socket, $ip, $port);
if ( $result == FALSE) {

}

$in = 'HO ';
$in .= 'first blood--------';
$out = '';

// 3. 向服务端写入
if( !socket_write($socket, $in, strlen($in)) ) {
    echo 'write fail: ' . socket_strerror(socket_last_error());
} else {
    echo '-----send to server succefully! \r\n----';
    echo 'the content is ' . $in;
}

// 3. 从服务端读取
while ( $out = socket_read($socket, 8129) ) {
    echo '-----receive from server succefully!\r\n------';
    echo 'the contents is ' . $out;
}

// 4. 关闭
echo '----close socket ...';
socket_close($socket);
echo 'closed ok.';