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Last updated: Fri, 26 Jan 2007

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# socket_get_option

(PHP 4 >= 4.3.0, PHP 5)

socket_get_option -- 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 socket specified by the `socket` parameter. socket_get_option() will return `FALSE` on failure.

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.

Таблица 1. Available Socket Options

Option | Description
--- | ---
SO_DEBUG | Reports whether debugging information is being recorded.
SO_ACCEPTCONN | Reports whether socket listening is enabled.
SO_BROADCAST | Reports whether transmission of broadcast messages is supported.
SO_REUSEADDR | Reports whether local addresses can be reused.
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.
SO_LINGER | Reports whether the `socket` lingers on socket_close() if data is present.
SO_OOBINLINE | Reports whether the `socket` leaves out-of-band data inline.
SO_SNDBUF | Reports send buffer size information.
SO_RCVBUF | Reports recieve buffer size information.
SO_ERROR | Reports information about error status and clears it.
SO_TYPE | Reports the `socket` type.
SO_DONTROUTE | Reports whether outgoing messages bypass the standard routing facilities.
SO_RCVLOWAT | Reports the minimum number of bytes to process for `socket` input operations. ( Defaults to 1 )
SO_RCVTIMEO | Reports the timeout value for input operations.
SO_SNDLOWAT | Reports the minimum number of bytes to process for `socket` output operations.
SO_SNDTIMEO | Reports the timeout value specifying the amount of time that an output function blocks because flow control prevents data from being sent.

> Замечание: This function used to be called `socket_getopt()` prior to PHP 4.3.0

add a note User Contributed Notes
socket_get_option
X_Crikou
21-Jan-2004 09:38
`Here is all available options for SOL_SOCKET.
For example, after creating your socket with
$sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname("tcp"));
$opt=array(
SO_BROADCAST,
SO_DONTROUTE,
SO_DEBUG,
SO_ERROR,
SO_FREE,
SO_KEEPALIVE,
SO_LINGER,
SO_NOSERVER,
SO_OOBINLINE,
SO_RCVBUF,
SO_RCVLOWAT,
SO_RCVTIMEO,
SO_REUSEADDR,
SO_SNDBUF,
SO_SNDLOWAT,
SO_SNDTIMEO,
SO_TYPE);
foreach ($opt as $value) {
var_dump(socket_get_option($sock, SOL_SOCKET, $value));
}`
add a note
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Last updated: Fri, 26 Jan 2007
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