set() public method Adds a new header. If

has() public method Returns a value indicating whether

get() public method Returns the named header(s).

fromArray() public method (available since version 2.0.3) Populates

offsetExists() public method Returns whether there is

$count public read-only property The number of headers

setDefault() public method Sets a new header only if it

getCount() public method Returns the number of headers

count() public method Returns the number of headers in

toArray() public method Returns the collection as a PHP