stream_socket_client

(PHP 5, PHP 7, PHP 8)

stream_socket_clientOpen Internet or Unix domain socket connection

Descrizione

stream_socket_client(
    string $address,
    int &$error_code = null,
    string &$error_message = null,
    ?float $timeout = null,
    int $flags = STREAM_CLIENT_CONNECT,
    ?resource $context = null
): resource|false

Initiates a stream or datagram connection to the destination specified by address. The type of socket created is determined by the transport specified using standard URL formatting: transport://target. For Internet Domain sockets (AF_INET) such as TCP and UDP, the target portion of the address parameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets, the target portion should point to the socket file on the filesystem.

Nota:

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

Elenco dei parametri

address

Address to the socket to connect to.

error_code

Will be set to the system level error number if connection fails.

error_message

Will be set to the system level error message if the connection fails.

timeout

Number of seconds until the connect() system call should timeout. By default, default_socket_timeout is used.

Nota: This parameter only applies when not making asynchronous connection attempts.

Nota:

To set a timeout for reading/writing data over the socket, use the stream_set_timeout(), as the timeout only applies while making connecting the socket.

flags

Bitmask field which may be set to any combination of connection flags. Currently the select of connection flags is limited to STREAM_CLIENT_CONNECT (default), STREAM_CLIENT_ASYNC_CONNECT and STREAM_CLIENT_PERSISTENT.

context

A valid context resource created with stream_context_create().

Valori restituiti

On success a stream resource is returned which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()), false on failure.

Errori/Eccezioni

On failure the error_code and error_message arguments will be populated with the actual system level error 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. Note that the error_code and error_message arguments will always be passed by reference.

Log delle modifiche

Versione Descrizione
8.0.0 timeout and context are now nullable.

Esempi

Example #1 stream_socket_client() example

<?php
$fp
= stream_socket_client("tcp://www.example.com:80", $errno, $errstr, 30);
if (!
$fp) {
echo
"$errstr ($errno)<br />\n";
} else {
fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
while (!
feof($fp)) {
echo
fgets($fp, 1024);
}
fclose($fp);
}
?>

Example #2 Using UDP connection

Retrieving the day and time from the UDP service "daytime" (port 13) on localhost.

<?php
$fp
= stream_socket_client("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);
}
?>

Note

Avviso

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.

Nota: Nella specifica numerica degli indirizzi IPv6 (es. fe80::1) occorre racchiudere l'IP tra parentesi quadre. Ad esempio, tcp://[fe80::1]:80.

Nota:

Depending on the environment, the Unix domain or the optional connect timeout may not be available. A list of available transports can be retrieved using stream_get_transports(). See List of Supported Socket Transports for a list of built in transports.

Vedere anche:

  • stream_socket_server() - Create an Internet or Unix domain server socket
  • stream_set_blocking() - Set blocking/non-blocking mode on a stream
  • stream_set_timeout() - Set timeout period on a stream
  • stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by seconds and microseconds
  • fgets() - Prende una riga da un puntatore a file
  • fgetss() - Prende una riga da un puntatore a file ed elimina i tag HTML
  • fwrite() - Scrive un file salvaguardando la corrispondenza binaria
  • fclose() - Chiude un puntatore a file aperto
  • feof() - Verifica se è stata raggiunta la fine del file su un puntatore a file
  • cURL Funzioni

add a note

User Contributed Notes 2 notes

up
22
nicholas at nicholaswilliams dot net
15 years ago
For those wanting to use stream_socket_client() to connect to a local UNIX socket who can't find documentation on how to do it, here's a (rough) example:

<?php

$sock
= stream_socket_client('unix:///full/path/to/my/socket.sock', $errno, $errstr);

fwrite($sock, 'SOME COMMAND'."\r\n");

echo
fread($sock, 4096)."\n";

fclose($sock);

?>
up
10
Vasil Rangelov a.k.a. boen_robot
13 years ago
The remote_socket argument, in its end (well... after the port), can also contain a "/" followed by a unique identifier. This is especially useful if you want to create multiple persistent connections to the same transport://host:port combo.

Example:
<?php
$socket
= stream_socket_client('tcp://mysql.example.com:3306/root', $errorno, $errorstr, $timeout, STREAM_CLIENT_CONNECT | STREAM_CLIENT_PERSISTENT);
?>

Note that while (p)fsockopen() follows a similar scheme, it doesn't have this particular feature.
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