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Description: A simple PHP application that accepts a visitor’s email address and emails them random XKCD comics every five minutes.

Folder Structure

src/
    crontab
    view/
        index.html
        css/
            main.css
    server/
        sample_config.php
        server.php
        email.php
        activation.php
        deactivation.php

Cronjob executed using crontab command in src folder in Ubuntu on Live Demo

Description:

• User visits website and enters name and email and submits then server.php is executed and name, email is stored in sublist table of database
• There four Columns in Database {sno: INT PRIMARY KEY and Auto Increment, name: VARCHAR, email: VARCHAR UNIQUE, sub: (0 or 1) Default-0}
• They are stored in mysql database using mysqli() commands
• And an email is sent for email verifcation
• Link in email when run on browser executes activation.php which sets sub value of that email to 1.
• And then according to crontab timer email.php is executed every 5 minutes which sends random xkcd comic extracted from the random url to all users whose sub value in database is 1 and in email the image is embedded as well as attached also deactivation is included.
• When User runs the deactivation link in the browser the deactivation.php script is executed and the sub value of that email is set to 0.