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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)

주의
이 함수는 실험적입니다. 이 함수의 작동, 함수의 이름, 그리고 이 함수에 대해 모든 문서는 이후의 PHP 릴리즈에서 예고 없이 변경할 수 있습니다. 이 함수의 사용에 관한 것은 사용자 책임입니다.

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.

표 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.

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

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socket_create | 위로 | socket_getpeername