546 Part (Anonymous web server) III: Developing E-mail Solutions Campaign Message
546 Part III: Developing E-mail Solutions Campaign Message Unsubscription Tracking Application Yes Yes Show error message Start Is Request Valid? Show confirmation page End Confirmed? No No E-campaign Database Add user to unsubscription database Dear Joe, Thank you for visiting our Web site and filling out the inquiry form. Based on your interest we have identified the following resources for you. Please visit at your convenience. Click here to visit ROI Mail Thanks again! Kind Regards, PHP Team, EVOKNOW Click here to remove from future mailing Figure 15-9: How the unsubscription tracking application works. If the mode is not test, the checksum value of the request is compared with the calculated checksum. If both checksum values match, the unsubscription request is considered valid and the askForConfirmation() method is called to confirm the unsubscription request. If the user confirms the unsubscription request by continuing forward, the unsubUser() method is called to store the unsubscription request in the database. computeCheckSum() This method implements a simple checksum algorithm using USER ID ($uid), campaign ID ($c), and a random number stored in the configuration file called $SECRET. This checksum value is compared with the campaign-execution-applicationgenerated checksum stored in the unsubscription link to check the validity of the request.