socket_set_option

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

socket_set_optionソケットのオプションを設定する

説明

socket_set_option(
    Socket $socket,
    int $level,
    int $option,
    array|string|int $value
): bool

socket_set_option() 関数は、level が指すプロトコルレベルでソケット socket のオプション option に値 value を設定します。

パラメータ

socket

socket_create() あるいは socket_accept() で作成した Socket クラスのインスタンス。

level

level パラメータは、オプションのプロトコルレベルを指定します。 例えば、オプションをソケットレベルで設定するには level パラメータに SOL_SOCKET を指定します。 TCP のようなそれ以外のレベルの場合、そのレベルのプロトコル番号を指定します。 プロトコル番号は getprotobyname() 関数を使用して取得可能です。

option

使用可能なソケットオプションは socket_get_option() 関数と同じです。

value

オプションの値。

戻り値

成功した場合に true を、失敗した場合に false を返します。

変更履歴

バージョン 説明
8.0.0 socket は、Socket クラスのインスタンスになりました。 これより前のバージョンでは、リソース型でした。

例1 socket_set_option() の例

<?php
$socket
= socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

if (!
is_resource($socket)) {
echo
'ソケットを作成できません: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1)) {
echo
'ソケットのオプションを設定できません: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!
socket_bind($socket, '127.0.0.1', 1223)) {
echo
'ソケットをバインドできません: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

$rval = socket_get_option($socket, SOL_SOCKET, SO_REUSEADDR);

if (
$rval === false) {
echo
'ソケットのオプションを取得できません: '. socket_strerror(socket_last_error()) . PHP_EOL;
} else if (
$rval !== 0) {
echo
'SO_REUSEADDR がソケットに設定されています!' . PHP_EOL;
}
?>

参考

add a note

User Contributed Notes 8 notes

up
7
drenintell
19 years ago
To expand a bit more on what "tim at e2-media dot co dot nz" started.

SO_SNDTIMEO is one of the many constants you can use with socket_set_option.

See http://ca.php.net/manual/en/ref.sockets.php for the available Predefind Constants and visit http://man.he.net/man2/setsockopt for the meaning of the ones relevant.

Tim's example might seem at first a bit non-intuitive since he is using the SO_SNDTIMEO constant. Which means, if the socket has to send out data, it must do it within the limit specified - in his case 10 seconds. Usually you won't set a timeout for sending out data. Nevertheless, the example is valid, and there are situations where you need to do so.

A more intuitive use of socket_set_option would be to set a time out for a blocking socket (a socket that waits for data to be receive when read from). You would do this like so:

socket_set_option($socket,SOL_SOCKET, SO_RCVTIMEO, array("sec"=>0, "usec"=>100));

Notice that sec= 0 and usec= 100; Depending on how long you want your program to wait to recieve data, you might want to change these values.

Regards,
drenintell
up
1
aeolianmeson at ifacfchi dot blitzeclipse dot com
16 years ago
Lingering will sometimes not work when you're working with non-blocking sockets. Even if the socket is set to linger and you keep tying to close until the socket doesn't return an error and the resource is no longer identifiable as type 'Socket', the socket may STILL close without sending everything.

Therefore, in the event that you are using non-blocking sockets (which is preferable if you care at all about signaling), you should set the socket as blocking (socket_set_block()) before calling to close it. This will allow everything to flush before it returns.

Dustin Oprea
up
0
gmail user asmqb7
5 years ago
PLEASE NOTE

PHP 7.3.6, and probably many previous versions, automatically sets SO_REUSEADDR when you use stream_socket_server().

php_network_bind_socket_to_local_addr() is called at https://github.com/php/php-src/blob/623911f993f39ebbe75abe2771fc89faf6b15b9b/main/streams/xp_socket.c#L675 and defined at https://github.com/php/php-src/blob/61a6a6ec51297506c54f3c6e60ace9b892d0a3e4/main/network.c#L401 and if you take a look you'll see

#ifdef SO_REUSEADDR
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&sockoptval, sizeof(sockoptval));
#endif

I initially thought I'd need to play with context options to turn this on, but no, the simplest single-arg call with no error checking and just an address, works for me.

strace your PHP binary to be 100% sure:

...
setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
...

The chances are you ARE using SO_REUSEADDR unless you're using a 100-year old UNIX clone in a month with a Z in it.
up
0
renmengyang567 at gmail dot com
5 years ago
<question>
Why is the size of the buffer 2 times that set by me?
<?php
//Before setting the cache area
$sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
socket_bind($sock, '127.0.0.1',5000);
socket_listen($sock,1024);
$sndbuf = socket_get_option($sock,SOL_SOCKET,SO_SNDBUF);
$rcvbuf = socket_get_option($sock,SOL_SOCKET,SO_RCVBUF);
printf("send buffer size(写缓存区大小):%sm \n",$sndbuf/1024);
printf("receive buffer(读缓存区大小)%sm \n",$rcvbuf/1024);

//After setting the cache area
$snd_buf = 1024*3;
$rcv_buf = 1024*3;

socket_set_option($sock,SOL_SOCKET,SO_SNDBUF, $snd_buf);
socket_set_option($sock,SOL_SOCKET,SO_RCVBUF, $rcv_buf);
$sndbuf = socket_get_option($sock,SOL_SOCKET,SO_SNDBUF);
$rcvbuf = socket_get_option($sock,SOL_SOCKET,SO_RCVBUF);

printf("send buffer size(写缓存区大小):%sm \n",$sndbuf/1024);
printf("receive buffer size(读缓存区大小)%sm \n",$rcvbuf/1024);
?>
up
0
ludvig dot ericson at gmail dot com
17 years ago
I would like to comment on the previous note regarding blocking sockets.
There is more to blocking sockets than waiting for data to be received when trying to be read upon, just to make example, a listening blocking socket will wait for a client to try to connect before it returns when you socket_accept() it.
up
0
tim at e2-media dot co dot nz
20 years ago
To set a socket timeout value (assuming you've set it blocking) use:

socket_set_option(
$socket,
SOL_SOCKET, // socket level
SO_SNDTIMEO, // timeout option
array(
"sec"=>10, // Timeout in seconds
"usec"=>0 // I assume timeout in microseconds
)
);
up
-2
DaveRandom
13 years ago
Setting the socket timeout microseconds ('usec') does not work under Windows, at least under PHP/5.2.9:

<?php

$timeout
= array('sec'=>1,'usec'=>500000);
socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,$timeout);
var_dump(socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO));

?>

Output on Windows box:

array(2) {
["sec"]=>
int(1)
["usec"]=>
int(0)
}

Output on Linux box:

array(2) {
["sec"]=>
int(1)
["usec"]=>
int(500000)
}
up
-5
ckozler at kozler dot net
12 years ago
It appears that Winsock does not acknowledge timeout (send and receive) on Windows.
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