Feeds: Introduce feed_links_args and feed_links_extra_args filters.

This allows for more flexibility in modifying how feed links are displayed by the `feed_links()` and `feed_links_extra()` functions, including, for example, a way to change the `»` separator to something else.

Follow-up to [10377], [33838], [33839], [53125], [54161].

Props topdownjimmy, tw2113, williampatton.
Fixes #43225.

git-svn-id: https://develop.svn.wordpress.org/trunk@58821 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/general-template.php

@@ -3120,6 +3120,15 @@ function feed_links( $args = array() ) {
 
 	$args = wp_parse_args( $args, $defaults );
 
+	/**
+	 * Filters the feed links arguments.
+	 *
+	 * @since 6.7.0
+	 *
+	 * @param array $args An array of feed links arguments.
+	 */
+	$args = apply_filters( 'feed_links_args', $args );
+
 	/**
 	 * Filters whether to display the posts feed link.
 	 *
@@ -3182,6 +3191,15 @@ function feed_links_extra( $args = array() ) {
 
 	$args = wp_parse_args( $args, $defaults );
 
+	/**
+	 * Filters the extra feed links arguments.
+	 *
+	 * @since 6.7.0
+	 *
+	 * @param array $args An array of extra feed links arguments.
+	 */
+	$args = apply_filters( 'feed_links_extra_args', $args );
+
 	if ( is_singular() ) {
 		$id   = 0;
 		$post = get_post( $id );