"options"=>array是什么意义

$var=300;

$int_options = array(
"options"=>array
 (
 "min_range"=>0,
 "max_range"=>256
 )
);

if(!filter_var($var, FILTER_VALIDATE_INT, $int_options))
 {
 echo("Integer is not valid");
 }
else
 {
 echo("Integer is valid");
 }
?>

$int_options = array(
	"options"=>array
	(
		"min_range"=>0,
		"max_range"=>256
		)
	);