wp-includes/load.php:1336Determines whether the current request is for the login screen.
boolfunction is_login() { return false !== stripos( wp_login_url(), $_SERVER['SCRIPT_NAME'] );}Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/load.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.