(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_listen — Listens for a connection on a socket
$backlog= 0 ] )
socket_listen() is applicable only to sockets of
A valid socket resource created with socket_create().
A maximum of
backlogincoming 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.
The maximum number passed to the
backlogparameter 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 platform.