wp-includes/class-wp-recovery-mode.php:152Checks whether recovery mode has been initialized.
bool public function is_initialized() { return $this->is_initialized; }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.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.