Multiple Email Support for Alerts

Hey Edir,

I am looking to send reports to multiple e-mail addresses with your plugin. However in its current state, it does not support that feature to handle validating multiple e-mails.

I found that it will not support these multiple e-mails because of the function is_email() in your validate method.

I added the ability to manage this functionality in locally and have it working.

I’d love if this could make it in to a patch in the near future so I can start pushing out reports to multiple people.

The changes I made to support this are below.

/*
* Validating fields
*/
static public function validate($input) {
	if ( ! empty( $input['email'] ) ) {
		// Remove any whitespace
		$input['email'] = preg_replace('/\s/', '', $input['email']);

		// Check for multiple emails, separated by the comma (,)
		$emails = explode( ',', $input['email'] );

		// Loop through the emails and ensure they are all valid
		foreach ( $emails as $email ) {
			if ( ! is_email( $email ) ) {
				add_settings_error( self::$id . '_notification', 'invalid-email', __( 'You have entered an invalid e-mail address.', self::$id ) );
			}
		}

	}

	return $input;
}

I also extended the Introduction to notify how to add multiple e-mails.

/*
* Introduction
*/
static public function introduction() {

	echo '<p>' . __('Fill the options below if you want to be notified by mail about new vulnerabilities. To add multiple e-mail addresses, separate them via comma (,).', self::$id) . '</p>';

}