<?php
 /**
  * uninstall this plugin.
  */
 if ( !defined( 'WP_UNINSTALL_PLUGIN' ) ) {
     exit();
 }
 
 wp_clear_scheduled_hook( 'rucy_update_reserved_content' );
 delete_option( 'rucy_post_type' );
 delete_option( 'rucy_version' );
 $all_posts = get_posts( 'numberposts=-1&post_status=' );
 $rc_post_meta_keys = array(
     'rc_reserv_accept',
     'rc_reserv_content',
     'rc_reserv_date',
     'rc_reserv_feature_image',
     'rc_reserv_accept_feature_image',
     'rc_reserv_accept_post_update',
     'rc_rollback_accept',
     'rc_rollback_date',
     'rc_rollback_accept_update_date',
     'rc_rollback_accept_feature_image',
 );
 foreach ( $all_posts as $post_info ) {
     foreach ( $rc_post_meta_keys as $key ) {
         delete_post_meta( $post_info->ID, $key );
     }
 }