Creating a newsletter plugin in WordPress is relatively simple. First, you will need to create a plugin directory in your WordPress installation.
Within this directory, create a new folder called “newsletter”. Within the “newsletter” folder, create a new file called “config.php” and add the following lines of code:.
define( ‘WP_USE_WPLIB’, true ); define( ‘WPLIB_INCLUDE’, ‘/usr/local/lib/wp-libs/wplib/include’ );
Next, you will need to create a file called “functions.php” and add the following code:
function get_newsletter_subscribers() { $subscribers = array(); // Get subscribers from the database $subscribers = $wpdb->get_results(); // If there are no subscribers return false if ( !$subscribers ) { return false; } // Loop through each subscriber and set the subscriber’s ID to their string value $subscriber = array_shift($subscribers); $id = substr($subscriber, 0, 5); $subscriberID = $id; // Set the subscriber’s email address $email = ‘info@example.com’; // Send an email to the subscriber informing them that their subscription has been updated wp_mail( $email, ‘Your subscription has been updated!’ ); return true; }
In this code, we are using the get_newsletter_subscribers() function to populate an array with all of the subscribers’ email addresses. Next, we use those email addresses to send an email notification to each subscriber informing them that their subscription has been updated.
Finally, we return true from our get_newsletter_subscribers() function so that we can continue processing the rest of our subscribers.