wordpress-delete-all.php

<?php

/**
* !!WARNING!!
* This script will delete everything you have in wordpress.
* I use it only when developing something that requires me to delete everything, e.g. importer. 
* You can comment some parts out if you need to quickly delete just posts, or pages or so, but still be very careful!!!
*
* @author Denis Žoljom (https://github.com/dingo-d)
* @license Free to use at your own risk
* @version 1.0.0
*
*/


//Fire the delete all function after all the plugins and theme are fully loaded to catch all the custom post types and terms too.
add_action('wp_loaded', 'delete_all');

if ( !function_exists( 'delete_all' ) ) {
    function delete_all() {
        global $wpdb;
        //Get all the post types, terms, menus etc.
        $menus = get_terms( 'nav_menu', array( 'hide_empty' => false ) );
        $all_post_types = get_post_types();
        $all_taxonomies = get_taxonomies();
        $all_options = wp_load_alloptions();
        //Delete all options
        foreach ( $all_options as $option ) {
            delete_option( $option );
        }
        //Delete all menus
        foreach ( $menus as $menu => $menu_obj ) {
            wp_delete_nav_menu( $menu_obj->term_id );
        }
        //Delete all post types, that includes custom post types as well
        foreach ( $all_post_types as $post_type => $post_type_value ) {
            $temp_posts = get_posts( array( 'post_type' => $post_type, 'posts_per_page' => -1, 'post_status' => 'any' ) );
            foreach ( $temp_posts as $temp_post => $temp_post_value ) {
                wp_delete_post( $temp_post_value->ID, true );
            }
        }
        //Delete any customizer modifications, if you use other theme option frameworks, you'll need to add the code to remove them manually
        remove_theme_mods();
        //Delete all terms from custom taxonomy. Taken from here: http://wpsmith.net/2014/plugin-uninstall-delete-terms-taxonomies-wordpress-database/
        foreach ( $all_taxonomies as $taxonomy ) {
            // Prepare & excecute SQL - also deletes Uncategorized from posts category!
            $terms = $wpdb->get_results( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy IN ( '%s' ) ORDER BY t.name ASC", $taxonomy ) );

        	// Delete Terms
			if ( $terms ) {
				foreach ( $terms as $term ) {
					$wpdb->delete( $wpdb->term_taxonomy, array( 'term_taxonomy_id' => $term->term_taxonomy_id ) );
					$wpdb->delete( $wpdb->term_relationships, array( 'term_taxonomy_id' => $term->term_taxonomy_id ) );
					$wpdb->delete( $wpdb->terms, array( 'term_id' => $term->term_id ) );
					delete_option( 'prefix_' . $taxonomy->slug . '_option_name' );
				}
			}

			// Delete Taxonomy
			$wpdb->delete( $wpdb->term_taxonomy, array( 'taxonomy' => $taxonomy ), array( '%s' ) );
        }
    }
}