wp-includes/class-wp-recovery-mode-cookie-service.php:126Gets the session identifier from the cookie.
$cookiestringoptional''string|WP_Error public function get_session_id_from_cookie( $cookie = '' ) { if ( ! $cookie ) { if ( empty( $_COOKIE[ RECOVERY_MODE_COOKIE ] ) ) { return new WP_Error( 'no_cookie', __( 'No cookie present.' ) ); } $cookie = $_COOKIE[ RECOVERY_MODE_COOKIE ]; } $parts = $this->parse_cookie( $cookie ); if ( is_wp_error( $parts ) ) { return $parts; } list( , , $random ) = $parts; return sha1( $random ); }Introduced in 5.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-recovery-mode-cookie-service.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.