fsockopen

Open Internet or Unix domain socket connection.

fsockopen Function synopsis

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

Parameters

$hostname

Typestring

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

OptionalTypeintDefault value-1

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

$error_code

Passed by reference, OptionalDefault valuenull

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

$error_message

Passed by reference, OptionalDefault valuenull

The error message as a string.

$timeout

OptionalType?floatDefault valuenull

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

Note that the parameters $error_code and $error_message are passed by reference, and contain additional/updated context data that may be useful.