Uninstall and cleanup hooks in Wordpress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register an uninstall hook for a WordPress plugin.

Wordpress

register_uninstall_hook(__FILE__, '[1]');

Drag options to blanks, or click blank then click option'

Amy_plugin_uninstall

Binit

Cdeactivate_plugin

Dactivate_plugin

Attempts:

3 left

💡 Hint

Common Mistakes

Using activation or deactivation hooks instead of uninstall hook.

Passing a hook name instead of a function name.

The register_uninstall_hook function requires the name of the uninstall callback function as the second argument.

2fill in blank

medium

Complete the uninstall function to delete a custom option from the database.

Wordpress

function my_plugin_uninstall() {
    [1]('my_plugin_option');
}

Drag options to blanks, or click blank then click option'

Adelete_option

Bupdate_option

Cadd_option

Dget_option

Attempts:

3 left

💡 Hint

Common Mistakes

Using update_option instead of delete_option.

Trying to get_option instead of deleting.

The delete_option function removes an option from the WordPress database.

3fill in blank

hard

Fix the error in the uninstall function to remove a custom database table.

Wordpress

function my_plugin_uninstall() {
    global $wpdb;
    $table_name = $wpdb->prefix . 'my_plugin_data';
    $wpdb->query("[1]");
}

Drag options to blanks, or click blank then click option'

ADELETE TABLE $table_name

BDROP TABLE $table_name

CDROP TABLE IF EXISTS $table_name

DREMOVE TABLE $table_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using DELETE TABLE which is invalid SQL.

Not checking if the table exists before dropping.

Using DROP TABLE IF EXISTS safely removes the table if it exists, avoiding errors.

4fill in blank

hard

Fill both blanks to remove a custom post type and its metadata during uninstall.

Wordpress

function my_plugin_uninstall() {
    $posts = get_posts(array('post_type' => '[1]', 'numberposts' => -1));
    foreach ($posts as $post) {
        delete_post_meta($post->ID, '[2]');
        wp_delete_post($post->ID, true);
    }
}

Drag options to blanks, or click blank then click option'

Amy_custom_type

Bmy_custom_meta

Cpost_meta_key

Dcustom_post

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong post type name.

Deleting wrong meta key.

The first blank is the custom post type name. The second blank is the meta key to delete.

5fill in blank

hard

Fill all three blanks to unregister a shortcode and remove its option during uninstall.

Wordpress

function my_plugin_uninstall() {
    [1]('[2]');
    [3]('my_plugin_shortcode_option');
}

Drag options to blanks, or click blank then click option'

Aremove_shortcode

Bdelete_option

Cmy_plugin_shortcode

Dunregister_shortcode

Attempts:

3 left

💡 Hint

Common Mistakes

Using unregister_shortcode which does not exist.

Not deleting the option after removing shortcode.

remove_shortcode unregisters the shortcode by name, and delete_option removes the stored option.