Noptin_Ajax::delete_all_subscribers()

	public function delete_all_subscribers() {
		global $wpdb;

		// Ensure the nonce is valid...
		check_ajax_referer( 'noptin_subscribers' );

		// ... and that the user can import subscribers.
		if ( ! current_user_can( get_noptin_capability() ) ) {
			wp_die( -1, 403 );
		}

		// Check if we're only deleting a few subscribers.
		if ( ! empty( $_POST['data'] ) && ( ! empty( $_POST['data']['meta_key'] ) || ! empty( $_POST['data']['_subscriber_via'] ) ) ) {

			$data = $_POST['data'];
			$delete = array( 'paged', 'orderby', 'order', 'page' );

			foreach ( $delete as $key ) {
				if ( isset( $data[$key] ) ) {
					unset( $data[$key] );
				}
			}

			if ( empty( $data['meta_query'] ) || ! is_array( $data['meta_query'] ) ) {
				$data['meta_query'] = array();
			}

			if ( ! empty( $data['_subscriber_via'] ) ) {
				$data['meta_query'][] = array(
					'key'   => '_subscriber_via',
					'value' => $data['_subscriber_via'],
				);
				unset( $data['_subscriber_via'] );
			}

			if ( ! empty( $data['_subscriber_via'] ) ) {
				$data['meta_query'][] = array(
					'key'   => '_subscriber_via',
					'value' => $data['_subscriber_via'],
				);
				unset( $data['_subscriber_via'] );
			}

			$data['fields'] = array( 'id' );
			$data['count_total'] = false;
			$data['number'] = '-1';

			$subscribers = new Noptin_Subscriber_Query( $data );

            foreach ( $subscribers->get_results() as $subscriber ) {
				delete_noptin_subscriber( $subscriber );
			}

			exit;
		}

		$table    = get_noptin_subscribers_table_name();
		$wpdb->query( "TRUNCATE TABLE $table" );

		$table    = get_noptin_subscribers_meta_table_name();
		$wpdb->query( "TRUNCATE TABLE $table" );

		$wpdb->delete( $wpdb->usermeta, array( 'meta_key' => 'noptin_subscriber_id' ), '%s' );

		do_action( 'noptin_delete_all_subscribers' );
		exit;
	}