delete all plugin data when plugin is uninstalled / fully deleted. cl…

…oses #524

mailchimp-for-wp.php

@@ -100,15 +100,16 @@ function _mc4wp_load_plugin()
 	require __DIR__ . '/integrations/bootstrap.php';
 }
 
-function _mc4wp_on_plugin_activation()
-{
-	// schedule the action hook to refresh the stored Mailchimp lists on a daily basis
-	$time_string = sprintf('tomorrow %d:%d am', rand(0, 7), rand(0, 59));
-	wp_schedule_event(strtotime($time_string), 'daily', 'mc4wp_refresh_mailchimp_lists');
-}
-
-
 // bootstrap main plugin
 add_action('plugins_loaded', '_mc4wp_load_plugin', 8);
 
-register_activation_hook(__FILE__, '_mc4wp_on_plugin_activation');
+// schedule the action hook to refresh the stored Mailchimp lists on a daily basis
+register_activation_hook(__FILE__, function() {
+	$time_string = sprintf('tomorrow %d:%d am', rand(0, 7), rand(0, 59));
+	wp_schedule_event(strtotime($time_string), 'daily', 'mc4wp_refresh_mailchimp_lists');
+});
+
+// remove scheduled hook when plugin is deactivated
+register_deactivation_hook(__FILE__, function() {
+	wp_clear_scheduled_hook('mc4wp_refresh_mailchimp_lists');
+});

uninstall.php

@@ -0,0 +1,12 @@
+<?php
+
+// if uninstall.php is not called by WordPress, die
+if (!defined('WP_UNINSTALL_PLUGIN')) die;
+
+global $wpdb;
+
+// Delete all MC4WP related options and transients
+$wpdb->query("DELETE FROM {$wpdb->options} WHERE option_name = 'mc4wp' OR option_name LIKE 'mc4wp%' OR option_name LIKE '_transient_mc4wp_%' OR option_name LIKE '_transient_timeout_mc4wp_%';");
+
+// Delete all MC4WP forms + settings
+$wpdb->query("DELETE p, pm FROM {$wpdb->posts} p LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID WHERE p.post_type = 'mc4wp-form';");