(PHP 4, PHP 5)

fsockopenOpen Internet or Unix domain socket connection


resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )

Initiates a socket connection to the resource specified by hostname.

PHP supports targets in the Internet and Unix domains as described in Список поддерживаемых транспортных протоколов. A list of supported transports can also be retrieved using stream_get_transports().

The socket will by default be opened in blocking mode. You can switch it to non-blocking mode by using stream_set_blocking().

The function stream_socket_client() is similar but provides a richer set of options, including non-blocking connection and the ability to provide a stream context.

Список параметров


If OpenSSL support is installed, you may prefix the hostname with either ssl:// or tls:// to use an SSL or TLS client connection over TCP/IP to connect to the remote host.


The port number.


If provided, holds the system level error number that occurred in the system-level connect() call.

If the value returned in errno is 0 and the function returned FALSE, it is an indication that the error occurred before the connect() call. This is most likely due to a problem initializing the socket.


The error message as a string.


The connection timeout, in seconds.


If you need to set a timeout for reading/writing data over the socket, use stream_set_timeout(), as the timeout parameter to fsockopen() only applies while connecting the socket.

Возвращаемые значения

fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()). If the call fails, it will return FALSE


Throws E_WARNING if hostname is not a valid domain.

Список изменений

Версия Описание
4.3.0 Added support for the timeout parameter on win32.
4.3.0 SSL and TLS over TCP/IP support was added.


Пример #1 fsockopen() Example

if (!
$fp) {
"$errstr ($errno)<br />\n";
} else {
$out "GET / HTTP/1.1\r\n";
$out .= "Host: www.example.com\r\n";
$out .= "Connection: Close\r\n\r\n";
    while (!
feof($fp)) {

Пример #2 Using UDP connection

The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine.

if (!
$fp) {
"ERROR: $errno - $errstr<br />\n";
} else {



Depending on the environment, the Unix domain or the optional connect timeout may not be available.


UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data.

Замечание: При указании числового адреса IPv6 (например, fe80::1) вы должны заключать его в квадратные скобки. Например, tcp://[fe80::1]:80.

Смотрите также

  • pfsockopen() - Открывает постоянное соединение с Интернет или сокетом Unix домена
  • stream_socket_client() - Открывает соединение с интернет-сокетом или с доменным сокетом Unix
  • stream_set_blocking() - Устанавливает блокирующий/неблокирующий режим на потоке
  • stream_set_timeout() - Устанавливает значение тайм-аута на потоке
  • fgets() - Читает строку из файла
  • fgetss() - Прочитать строку из файла и отбросить HTML-теги
  • fwrite() - Бинарно-безопасная запись в файл
  • fclose() - Закрывает открытый дескриптор файла
  • feof() - Проверяет, достигнут ли конец файла
  • socket_connect() - Initiates a connection on a socket
  • The Curl extension

Участник рейтинга Тэглайн 2010