uninstall.php

<?php

	/* if uninstall not called from WordPress exit */

	if ( !defined( 'WP_UNINSTALL_PLUGIN' ) )
		exit ();

	/* Delete all existence of this plugin */

	global $wpdb;

	$version_name = 'wpsite_post_status_notifi_verison';

	if ( !is_multisite() ) {

		// Delete blog option

		delete_option($version_name);

		/*
// Delete post meta data

		$posts = get_posts(array('posts_per_page' => -1));

		foreach ($posts as $post) {
			$post_meta = get_post_meta($post->ID);
			delete_post_meta($post->ID, $post_meta_data_name);
		}

		// Delete user meta data

		$users = get_users();

		foreach ($users as $user) {
			delete_user_meta($user->ID, $user_meta_data_name);
		}
*/
	}

	else {

		// Delete site option

		delete_site_option($version_name);

		/*
// Used to delete each option from each blog

	    $blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );

	    foreach ( $blog_ids as $blog_id )
	    {
	        switch_to_blog( $blog_id );

	        // Delete blog option

			delete_option($blog_option_name);

			// Delete post meta data

			$posts = get_posts(array('posts_per_page' => -1));

			foreach ($posts as $post) {
				$post_meta = get_post_meta($post->ID);
				delete_post_meta($post->ID, $post_meta_data_name);
			}

			// Delete user meta data

			$users = get_users();

			foreach ($users as $user) {
				delete_user_meta($user->ID, $user_meta_data_name);
			}

	        restore_current_blog();
	    }
*/
	}
?>