Опис

fsockopen(
    string $hostname,
    int $port = -1,
    int &$error_code = null,
    string &$error_message = null,
    ?float $timeout = null
): resource|false

Initiates a socket connection to the resource specified by hostname.

PHP supports targets in the Internet and Unix domains as described in Перелік підтримуваних транспортних протоколів у сокетах. 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.

Параметри

hostname

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.

port

The port number. This can be omitted and skipped with -1 for transports that do not use ports, such as unix://.

error_code

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

If the value returned in error_code 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.

error_message

The error message as a string.

timeout

The connection timeout, in seconds. When null, the default_socket_timeout php.ini setting is used.

Зауваження:
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.

Значення, що повертаються

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

Помилки/виключення

Throws E_WARNING if hostname is not a valid domain.

Журнал змін

Версія	Опис
8.0.0	`timeout` is nullable now.

Приклади

Приклад #1 fsockopen() Example

<?php
$fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    $out = "GET / HTTP/1.1\r\n";
    $out .= "Host: www.example.com\r\n";
    $out .= "Connection: Close\r\n\r\n";
    fwrite($fp, $out);
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
    fclose($fp);
}
?>

Приклад #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.

<?php
$fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr);
if (!$fp) {
    echo "ERROR: $errno - $errstr<br />\n";
} else {
    fwrite($fp, "\n");
    echo fread($fp, 26);
    fclose($fp);
}
?>

Примітки

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

Увага

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.

Зауваження: Вказуючи числову IPv6-адресу (напр. fe80::1), необхідно взяти IP-адресу в квадратні дужки, наприклад, tcp://[fe80::1]:80.

Прогляньте також

pfsockopen() - Open persistent Internet or Unix domain socket connection
stream_socket_client() - Open Internet or Unix domain socket connection
stream_set_blocking() - Set blocking/non-blocking mode on a stream
stream_set_timeout() - Set timeout period on a stream
fgets() - Gets line from file pointer
fgetss() - Gets line from file pointer and strip HTML tags
fwrite() - Binary-safe file write
fclose() - Closes an open file pointer
feof() - Tests for end-of-file on a file pointer
socket_connect() - Initiates a connection on a socket
The Curl extension