socket_get_option
(PHP 4 >= 4.3.0, PHP 5)
socket_get_option — Gets socket options for the socket
Description
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(). |