validate_user_signup() WordPress Function

function validate_user_signup() {
	$result     = validate_user_form();
	$user_name  = $result['user_name'];
	$user_email = $result['user_email'];
	$errors     = $result['errors'];

	if ( $errors->has_errors() ) {
		signup_user( $user_name, $user_email, $errors );
		return false;
	}

	if ( 'blog' === $_POST['signup_for'] ) {
		signup_blog( $user_name, $user_email );
		return false;
	}

	/** This filter is documented in wp-signup.php */
	wpmu_signup_user( $user_name, $user_email, apply_filters( 'add_signup_meta', array() ) );

	confirm_user_signup( $user_name, $user_email );
	return true;
}
Uses	Description
wp-signup.php:validate_user_form()	Validates user sign-up name and email.
wp-signup.php:signup_user()	Shows a form for a visitor to sign up for a new user account.
wp-signup.php:signup_blog()	Shows a form for a user or visitor to sign up for a new site.
wp-signup.php:confirm_user_signup()	Shows a message confirming that the new user has been registered and is awaiting activation.
wp-signup.php:add_signup_meta	Filters the new default site meta variables.
wp-includes/plugin.php:apply_filters()	Calls the callback functions that have been added to a filter hook.
wp-includes/ms-functions.php:wpmu_signup_user()	Records user signup information for future activation.