Automattic\WooCommerce\Internal\CustomerEmailVerification

EmailVerificationService::get_account_email │ private │ WC 1.0

The user's account email, lower-cased, or null when the user does not exist.

Lower-casing here is the single normalisation point, so the verified-status match and the key's email-binding hash stay consistent however the address was capitalised.

Method of the class: EmailVerificationService{}

No Hooks.

Returns

string|null.

Usage

// private - for code of main (parent) class only
$result = $this->get_account_email( $user_id ): ?string;
$user_id(int) (required)
WordPress user ID.

EmailVerificationService::get_account_email() code WC 11.0.1

woocommerce/src/Internal/CustomerEmailVerification/EmailVerificationService.php 
private function get_account_email( int $user_id ): ?string {
	$user = get_user_by( 'id', $user_id );

	return $user instanceof \WP_User ? strtolower( $user->user_email ) : null;
}