$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);

socket_bind($socket,'0.0.0.0',6666);

while(true){

    socket_listen($socket);

    $sock = socket_accept($socket);

    $res = socket_read($sock,2048);

    echo $res.PHP_EOL;

    socket_write($sock,'收到客户端消息: '.$res);

}

$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);

socket_connect($socket,'0.0.0.0',6666);

$msg = 'hlllo server';

socket_write($socket,$msg);

$res = socket_read($socket,2048);

echo $res;