This gist is used in the tutorial https://www.vijayan.in/how-to-create-custom-table-list-in-wordpress-admin-page

html_dropdown.php

<?php
...
	/**
	 * Navigation dropdown HTML generator
	 *
	 * @param array $args Argument array to generate dropdown.
	 *
	 * @return void
	 */
	private function html_dropdown( $args ) {
		?>

		<div class="<?php echo( esc_attr( $args['container']['class'] ) ); ?>">
			<label
				for="<?php echo( esc_attr( $args['select']['id'] ) ); ?>"
				class="<?php echo( esc_attr( $args['label']['class'] ) ); ?>">
			</label>
			<select
				name="<?php echo( esc_attr( $args['select']['name'] ) ); ?>"
				id="<?php echo( esc_attr( $args['select']['id'] ) ); ?>">
				<?php
				foreach ( $args['options'] as $id => $title ) {
					?>
					<option
					<?php if ( $args['select']['selected'] === $id ) { ?>
						selected="selected"
					<?php } ?>
					value="<?php echo( esc_attr( $id ) ); ?>">
					<?php echo esc_html( \ucwords( $title ) ); ?>
					</option>
					<?php
				}
				?>
			</select>
		</div>

		<?php
	}
...