gistfile1.php

	if ( is_multisite() ) {

			global $wpdb;

			// get current blogs from DB
			$blogs = $wpdb->get_results( "SELECT blog_id FROM {$wpdb->blogs} ORDER BY blog_id" );

			foreach ( $blogs as $blog ) {

				if ( is_main_site() ) {
					continue;
				}

				switch_to_blog( $blog->blog_id );



					// Delete Cron schedules.

					$schedules = $wpdb->get_col( $wpdb->prepare( "SELECT option_name FROM {$wpdb->prefix}options WHERE option_name LIKE %s", 'hmbkp_schedule_%' ) );

					foreach (
						array_map( function ( $schedule_id ) {
							return ltrim( $schedule_id, 'hmbkp_schedule_' );
						}, $schedules ) as $schedule_id
					) {
						$test[] = $schedule_id;
						//wp_clear_scheduled_hook( 'hmbkp_schedule_hook', array( 'id' => $item ) );
					}

			

				restore_current_blog();
				exit(var_dump($test));
			}
		}