wp-includes/class-wp-theme.php:1308Returns files in the theme's directory.
$typestring[]|stringoptionalnull$depthintoptional0$search_parentbooloptionalfalsestring[] public function get_files( $type = null, $depth = 0, $search_parent = false ) { $files = (array) self::scandir( $this->get_stylesheet_directory(), $type, $depth ); if ( $search_parent && $this->parent() ) { $files += (array) self::scandir( $this->get_template_directory(), $type, $depth ); } return array_filter( $files ); }Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.