[wp-trac] [WordPress Trac] #49219: feed.php calls apply_filters with too many arguments

[WordPress Trac]

#49219: feed.php calls apply_filters with too many arguments
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 Reporter:  bret.miller   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:
Component:  Feeds         |     Version:  5.3.2
 Severity:  normal        |  Resolution:  invalid
 Keywords:                |     Focuses:
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Changes (by SergeyBiryukov):

 * status:  new => closed
 * resolution:   => invalid
 * milestone:  Awaiting Review =>


Comment:

 Hi there, welcome to WordPress Trac! Thanks for the ticket.

 There are 1200+ instances of passing more than two arguments to
 `apply_filters()` in WordPress core.

 While the `WP_Hook::apply_filters()` method indeed only accepts two
 parameters, the [source:tags/5.3/src/wp-
 includes/plugin.php?marks=151,156,160,169,178,184#L143 apply_filters()]
 function accepts any number of parameters to pass to the callback function
 using `func_get_args()`.

 If you want your callback function to receive these additional parameters,
 you have to specify the number of arguments as the 4th parameter in your
 `add_filter()` call:
 {{{
 add_filter( 'get_bloginfo_rss', 'my_function', 10, 2 );
 }}}

 There is no bug here, this code works as intended.

 Related: #33891

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Ticket URL: <https://core.trac.wordpress.org/ticket/49219#comment:1>
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