wp-includes/theme.php:117$stylesheetstringoptional''$theme_rootstringoptional''WP_Themefunction wp_get_theme( $stylesheet = '', $theme_root = '' ) { global $wp_theme_directories; if ( empty( $stylesheet ) ) { $stylesheet = get_stylesheet(); } if ( empty( $theme_root ) ) { $theme_root = get_raw_theme_root( $stylesheet ); if ( false === $theme_root ) { $theme_root = WP_CONTENT_DIR . '/themes'; } elseif ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) { $theme_root = WP_CONTENT_DIR . $theme_root; } } return new WP_Theme( $stylesheet, $theme_root );}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/theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.