improvise the code

uninstall.php

@@ -22,21 +22,34 @@
 
 	/**
 	 * Function to delete all relevant data from the site (single or multisite).
+	 *
+	 * @param bool $is_multisite Whether it's a multisite installation.
 	 */
 	function dt_delete_data( $is_multisite = false ) {
 		global $wpdb;
 
 		// Delete post meta and posts of type 'dt_subscription'.
-		$subscription_post_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type = 'dt_subscription';" );
+		$subscription_post_ids = $wpdb->get_col(
+			"SELECT ID FROM $wpdb->posts WHERE post_type = %s",
+			'dt_subscription'
+		);
 
 		if ( ! empty( $subscription_post_ids ) ) {
 			$ids_string = implode( ',', array_map( 'intval', $subscription_post_ids ) );
 
 			// Delete subscription meta.
-			$wpdb->query( "DELETE FROM $wpdb->postmeta WHERE post_id IN ($ids_string);" );
+			$wpdb->query(
+				$wpdb->prepare(
+					"DELETE FROM $wpdb->postmeta WHERE post_id IN ($ids_string);"
+				)
+			);
 
 			// Delete subscription posts.
-			$wpdb->query( "DELETE FROM $wpdb->posts WHERE ID IN ($ids_string);" );
+			$wpdb->query(
+				$wpdb->prepare(
+					"DELETE FROM $wpdb->posts WHERE ID IN ($ids_string);"
+				)
+			);
 
 			// Clear the post cache.
 			wp_cache_set_posts_last_changed();
@@ -50,6 +63,8 @@ function dt_delete_data( $is_multisite = false ) {
 
 	/**
 	 * Delete all relevant options from a site (single or multisite).
+	 *
+	 * @param bool $is_multisite Whether it's a multisite installation.
 	 */
 	function delete_site_options( $is_multisite = false ) {
 		global $wpdb;
@@ -60,22 +75,19 @@ function delete_site_options( $is_multisite = false ) {
 			'_transient_timeout_dt_',
 		);
 
-		// Include multisite-specific prefixes if not a single site.
-		if ( ! $is_multisite ) {
-			$option_prefixes[] = '_site_transient_dt_';
-			$option_prefixes[] = '_site_transient_timeout_dt_';
-		}
-
-		// Determine the appropriate table and column based on multisite or single site.
+		// Include multisite-specific prefixes if it's not a single site.
+		// Also determine the appropriate table and column based on multisite or single site.
 		if ( $is_multisite ) {
-			$table = $wpdb->sitemeta;
-			$id_column = 'meta_id';
+			$option_prefixes[] = '_site_transient_dt_';
+			$option_prefixes[] = '_site_transient_timeout_dt_';	
+			$table      = $wpdb->sitemeta;
+			$id_column  = 'meta_id';
 			$key_column = 'meta_key';
 			$site_column = 'site_id';
-			$site_id = get_current_network_id();
+			$site_id    = get_current_network_id();
 		} else {
-			$table = $wpdb->options;
-			$id_column = 'option_id';
+			$table      = $wpdb->options;
+			$id_column  = 'option_id';
 			$key_column = 'option_name';
 		}
 
@@ -104,7 +116,11 @@ function delete_site_options( $is_multisite = false ) {
 			$ids_string = implode( ',', array_map( 'intval', $options_to_delete ) );
 
 			// Delete the options using the retrieved IDs.
-			$wpdb->query( "DELETE FROM $table WHERE $id_column IN ($ids_string);" );
+			$wpdb->query(
+				$wpdb->prepare(
+					"DELETE FROM $table WHERE $id_column IN ($ids_string);"
+				)
+			);
 
 			// Flush the relevant caches.
 			$cache_group = $is_multisite ? 'site-options' : 'options';