uninstall.php

<?php

if ( ! defined( 'ABSPATH' ) && ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit();
}

$settings = get_option( 'plugin_wp_listings_settings' );

if ( $settings['wp_listings_uninstall_delete'] ) {

	wp_listings_delete_listings();

	// Delete our Options.
	delete_site_option( 'plugin_wp_listings_settings' );
	delete_site_option( 'wp_listings_idx_featured_listing_wp_options' );
	delete_site_option( 'wp_listings_taxonomies' );
	delete_site_option( 'widget_wplistings-featured-listings' );
	delete_site_option( 'widget_listings-search' );
	delete_site_option( 'wp_listings_advanced_field_display_options' );

	// Delete cron job.
	wp_clear_scheduled_hook( 'wp_listings_idx_update' );
}

/**  Find and Delete all Listings */
function wp_listings_delete_listings() {
	global $wpdb;

	// Get all Listings.
	$args = [
		'post_type' => [ 'listing' ],
		'nopaging'  => true,
	];

	// Remove all Listings.
	$query = new WP_Query( $args );
	while ( $query->have_posts() ) {
		$query->the_post();
		$id = get_the_ID();

		$taxonomies             = [ 'status', 'locations', 'features', 'property-types' ];
		$post_featured_image_id = get_post_thumbnail_id( $id );

		wp_delete_attachment( $post_featured_image_id );
		delete_post_meta_by_key( ! empty( $id->ID ) );
		wp_delete_object_term_relationships( $id, $taxonomies );
		wp_delete_post( $id, true );
	}

	$wpdb->query( "DELETE FROM `{$wpdb->prefix}options` WHERE option_name LIKE '_transient_equity_listing_%'" );

	// Reset PostData.
	wp_reset_postdata();
}