wp-includes/feed.php:640Displays Site Icon in RSS2.
function rss2_site_icon() { $rss_title = get_wp_title_rss(); if ( empty( $rss_title ) ) { $rss_title = get_bloginfo_rss( 'name' ); } $url = get_site_icon_url( 32 ); if ( $url ) { echo '<image> <url>' . convert_chars( $url ) . '</url> <title>' . $rss_title . '</title> <link>' . get_bloginfo_rss( 'url' ) . '</link> <width>32</width> <height>32</height></image> ' . "\n"; }}Introduced in 4.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/feed.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.