wp-includes/class-wp-recovery-mode-cookie-service.php:24Checks whether the recovery mode cookie is set.
bool public function is_cookie_set() { return ! empty( $_COOKIE[ RECOVERY_MODE_COOKIE ] ); }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.