php man page for socket_set_option

SOCKET_SET_OPTION(3)							 1						      SOCKET_SET_OPTION(3)

socket_set_option - Sets socket options for the socket

SYNOPSIS
       bool socket_set_option (resource  $socket, int  $level, int  $optname, mixed  $optval)

DESCRIPTION
	The  socket_set_option(3)  function  sets  the	option specified by the $optname parameter, at the specified protocol $level, to the value
       pointed to by the $optval parameter for the $socket.

PARAMETERS
	      o $socket
		- A valid socket resource created with socket_create(3) or socket_accept(3).

	      o $level
		- 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(3) function.

	      o $optname
		- The available socket options are the same as those for the socket_get_option(3) function.

	      o $optval
		- The option value.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #1

	      socket_set_option(3) example

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

	      if (!is_resource($socket)) {
		  echo 'Unable to create socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
	      }

	      if (!socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1)) {
		  echo 'Unable to set option on socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
	      }

	      if (!socket_bind($socket, '127.0.0.1', 1223)) {
		  echo 'Unable to bind socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
	      }

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

	      if ($rval === false) {
		  echo 'Unable to get socket option: '. socket_strerror(socket_last_error()) . PHP_EOL;
	      } else if ($rval !== 0) {
		  echo 'SO_REUSEADDR is set on socket !' . PHP_EOL;
	      }
	      ?>

PHP Documentation Group 												      SOCKET_SET_OPTION(3)