wp-includes/general-template.php:1021Determines whether the site has a Site Icon.
$blog_idintoptional0boolfunction has_site_icon( $blog_id = 0 ) { return (bool) get_site_icon_url( 512, '', $blog_id );}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/general-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.