wp-includes/class-wp-recovery-mode-cookie-service.php:153Parses the cookie into its four parts.
$cookiestringarray|WP_Error private function parse_cookie( $cookie ) { $cookie = base64_decode( $cookie ); $parts = explode( '|', $cookie ); if ( 4 !== count( $parts ) ) { return new WP_Error( 'invalid_format', __( 'Invalid cookie format.' ) ); } return $parts; }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.