03-04-2009
That all depends on what you are trying to do i.e. what socket option you are trying to set.
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LEARN ABOUT PHP
socket_listen
SOCKET_LISTEN(3) 1 SOCKET_LISTEN(3)
socket_listen - Listens for a connection on a socket
SYNOPSIS
bool socket_listen (resource $socket, [int $backlog])
DESCRIPTION
After the socket $socket has been created using socket_create(3) and bound to a name with socket_bind(3), it may be told to listen for
incoming connections on $socket.
socket_listen(3) is applicable only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.
PARAMETERS
o $socket
- A valid socket resource created with socket_create(3).
o $backlog
- A maximum of $backlog incoming connections will be queued for processing. If a connection request arrives with the queue full
the client may receive an error with an indication of ECONNREFUSED, or, if the underlying protocol supports retransmission, the
request may be ignored so that retries may succeed.
Note
The maximum number passed to the $backlog parameter highly depends on the underlying platform. On Linux, it is silently
truncated to SOMAXCONN. On win32, if passed SOMAXCONN, the underlying service provider responsible for the socket will set
the backlog to a maximum reasonable value. There is no standard provision to find out the actual backlog value on this plat-
form.
RETURN VALUES
Returns TRUE on success or FALSE on failure. The error code can be retrieved with socket_last_error(3). This code may be passed to
socket_strerror(3) to get a textual explanation of the error.
SEE ALSO
socket_accept(3), socket_bind(3), socket_connect(3), socket_create(3), socket_strerror(3).
PHP Documentation Group SOCKET_LISTEN(3)