Gets socket options for the socket

Description

mixed socket_get_option ( resource $socket , int $level , int $optname )

The socket_get_option() function retrieves the value for the option specified by the optname parameter for the specified socket.

Parameters

socket

A valid socket resource created with socket_create() or socket_accept().

level

The level parameter specifies the protocol level at which the option resides. For example, to retrieve options at the socket level, a level parameter of SOL_SOCKET would be used. Other levels, such as TCP, can be used by specifying the protocol number of that level. Protocol numbers can be found by using the getprotobyname() function.

optname

**Available Socket Options**
Option	Description	Type
`SO_DEBUG`	Reports whether debugging information is being recorded.	int
`SO_BROADCAST`	Reports whether transmission of broadcast messages is supported.	int
`SO_REUSEADDR`	Reports whether local addresses can be reused.	int
`SO_KEEPALIVE`	Reports whether connections are kept active with periodic transmission of messages. If the connected socket fails to respond to these messages, the connection is broken and processes writing to that socket are notified with a SIGPIPE signal.	int
`SO_LINGER`	Reports whether the `socket` lingers on socket_close() if data is present. By default, when the socket is closed, it attempts to send all unsent data. In the case of a connection-oriented socket, socket_close() will wait for its peer to acknowledge the data. If `l_onoff` is non-zero and `l_linger` is zero, all the unsent data will be discarded and RST (reset) is sent to the peer in the case of a connection-oriented socket. On the other hand, if `l_onoff` is non-zero and `l_linger` is non-zero, socket_close() will block until all the data is sent or the time specified in `l_linger` elapses. If the socket is non-blocking, socket_close() will fail and return an error.	array. The array will contain two keys: `l_onoff` and `l_linger`.
`SO_OOBINLINE`	Reports whether the `socket` leaves out-of-band data inline.	int
`SO_SNDBUF`	Reports the size of the send buffer.	int
`SO_RCVBUF`	Reports the size of the receive buffer.	int
`SO_ERROR`	Reports information about error status and clears it.	int (cannot be set by socket_set_option())
`SO_TYPE`	Reports the `socket` type (e.g. `SOCK_STREAM`).	int (cannot be set by socket_set_option())
`SO_DONTROUTE`	Reports whether outgoing messages bypass the standard routing facilities.	int
`SO_RCVLOWAT`	Reports the minimum number of bytes to process for `socket` input operations.	int
`SO_RCVTIMEO`	Reports the timeout value for input operations.	array. The array will contain two keys: `sec` which is the seconds part on the timeout value and `usec` which is the microsecond part of the timeout value.
`SO_SNDTIMEO`	Reports the timeout value specifying the amount of time that an output function blocks because flow control prevents data from being sent.	array. The array will contain two keys: `sec` which is the seconds part on the timeout value and `usec` which is the microsecond part of the timeout value.
`SO_SNDLOWAT`	Reports the minimum number of bytes to process for `socket` output operations.	int
`TCP_NODELAY`	Reports whether the Nagle TCP algorithm is disabled.	int

Return Values

Returns the value of the given option, or FALSE on errors.

Examples

Example #1 socket_set_option() example


<?php
$socket = socket_create_listen(1223);

$linger = array('l_linger' => 1, 'l_onoff' => 1);
socket_set_option($socket, SOL_SOCKET, SO_LINGER, $linger);

var_dump(socket_get_option($socket, SOL_SOCKET, SO_REUSEADDR));
?>

Changelog

Version	Description
4.3.0	The name of this function was changed. It used to be called socket_getopt().