My widget has a number of options, set using the following method of the extended widget class:

public function update( $new_instance, $old_instance ) {

	$instance = array();
	$instance[ 'title' ]					= ( ! empty( $new_instance[ 'title' ] ) ) ? strip_tags( $new_instance[ 'title' ] ) : '';
	$instance[ 'ellcv_category' ]			= ( ! empty( $new_instance[ 'ellcv_category' ] ) ) ? $new_instance[ 'ellcv_category' ] : '';
	$instance[ 'ellcv_displayTitle' ]		= isset( $new_instance[ 'ellcv_displayTitle' ] ) && 'on' == $new_instance[ 'ellcv_displayTitle' ] ? true : false;
	$instance[ 'ellcv_displayExcerpt' ]		= isset( $new_instance[ 'ellcv_displayExcerpt' ] ) && 'on' == $new_instance[ 'ellcv_displayExcerpt' ] ? true : false;
	$instance[ 'ellcv_displayLink' ]		= isset( $new_instance[ 'ellcv_displayLink' ] ) && 'on' == $new_instance[ 'ellcv_displayLink' ] ? true : false;
	$instance[ 'ellcv_excludeCategory' ]	= isset( $new_instance[ 'ellcv_excludeCategory' ] ) && 'on' == $new_instance[ 'ellcv_excludeCategory' ] ? true : false;
	$instance[ 'ellcv_hideOnSinglePost' ]	= isset( $new_instance[ 'ellcv_hideOnSinglePost' ] ) && 'on' == $new_instance[ 'ellcv_hideOnSinglePost' ] ? true : false;
	$instance[ 'ellcv_maxPosts' ]			= ( ! empty( $new_instance[ 'ellcv_maxPosts' ] ) ) ? intval( $new_instance[ 'ellcv_maxPosts' ] ) : 5;
	$instance[ 'ellcv_maxPostAge' ]			= ( ! empty( $new_instance[ 'ellcv_maxPostAge' ] ) ) ? intval( $new_instance[ 'ellcv_maxPostAge' ] ) : null;
	$instance[ 'ellcv_defMediaURL' ]		= ( ! empty( $new_instance[ 'ellcv_defMediaURL' ] ) ) ? esc_url_raw( $new_instance[ 'ellcv_defMediaURL' ] ) : null;

	// Save site options (required so constructor function can get option before widget loaded)
	update_option( 'ellcv_excludeCat', $instance[ 'ellcv_excludeCategory' ] );
	update_option( 'ellcv_catID', $instance[ 'ellcv_category' ] );

	return $instance;
}

I’d like to be able to remove plugin options on plugin uninstall.

I’ve created an uninstall.php file for my plugin

<?php
// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

// Exit if we don't see the uninstall flag
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}
// Delete site options
delete_option('ellcv_excludeCat');
delete_option('ellcv_catID');
?>

So, I’m able to delete the options set as site options from the database, but what I’m still unclear about is how to also delete the other options, saved/recalled as instance properties from the WP database. I don’t know how to get a handle on them to remove them, from my uninstall.php.

I’m hazy on OOP techniques generally, unfortunately, being self-taught, and having been using functional programming techniques for many years.

The code for the entire widget is quite long, so I don’t want to post it here, but it’s basically the same, structurally as the example I link to above.

Any hints gratefully accepted.

a|x

Any tips

When I uninstall my plugin I want to remove all events (custom post type) and event postmeta from database. I use this code in uninstall.php for that:

// Delete events + metadata
global $wpdb;
$wpdb->query( "DELETE FROM {$wpdb->posts} WHERE post_type IN ( 'event' );" );
$wpdb->query( "DELETE meta FROM {$wpdb->postmeta} meta LEFT JOIN {$wpdb->posts} posts ON posts.ID = meta.post_id WHERE posts.ID IS NULL;" );

Taken from Woocommerce, and it works like a charm.
My question: the second query removes the event postmeta, but I don’t understand how it’s part of the first query? I mean, why does it only remove postmeta from events and not from all posts?

Guido

Codex:

//if uninstall not called from WordPress exit
if ( !defined( 'WP_UNINSTALL_PLUGIN' ) )
	exit ();

delete_option('example');

and alternate source (wptuts):

if(defined('WP_UNINSTALL_PLUGIN') ){  

  //delete options, tables or anything else  

}

So which is the correct way? I’m leaning towards the wptuts way, but only because it seems to make a bit more sense to me.
Thanks guys

// my-plugin/my-plugin.php
<?php
/*
Plugin Name: My Plugin
*/

// my-plugin/uninstall.php
<?php

When I click ‘Delete’ and then confirm, I get the following error:

Plugin could not be deleted due to an error: Could not fully remove the plugin(s) my-plugin/my-plugin.php.

What’s wrong here?

—

~/Sites/wordpress/wp-content/plugins/my-plugin $ ls -ll
total 16
-rwxrwxrwx@ 1 me  staff  34 13 Aug 21:43 my-plugin.php
-rwxrwxrwx@ 1 me  staff   6 13 Aug 21:44 uninstall.php

function sb_uninstall_plugin(){
	global $wpdb, $sb_ip_log;

	delete_option("sb_detection_of_spammers_cookies");
	delete_option("sb_detection_of_spammers_time");
	delete_option("sb_banned_message");
	$wpdb->query("DROP TABLE $sb_ip_log");
}

register_uninstall_hook(__FILE__, 'sb_uninstall_plugin');

The value of the option uninstall_plugins in the table wp_options: a:2:{i:0;b:0;s:22:”sb/spammer-blocker.php”;s:19:”sb_uninstall_plugin”;}

I also tried using uninstall.php without any success.
Thank you for your help!

delete_option('my_plugin_option');

However, if my plugin was running on a multisite installation, and it was activated and/or used on multiple subsites, then the above method won’t work. The above method will remove the option from the wp_options table, but it won’t remove it from tables wp_2_options, wp_3_options, etc.

I know I can just write a complete SQL script to go through all the tables and delete the options, but it seems like there needs to be a much more user-friendly way to help ensure all plugin authors are able to clean up after themselves.

Anyone know of such a way?