Weak hands cannot be planted, meager skills have no foundation. Shallow wisdom is futile, how can one hope for a good name?扰扰从役倦，屑屑身事微。少壮轻年月，迟暮惜光辉。
> $an_array Two-dimensional array to be padded.
*/
public function pad_array_to_max_cols( array &$an_array ): void {
$max_columns = $this->count_max_columns( $an_array );
// Extend the array to at least one column.
$max_columns = max( 1, $max_columns );
array_walk(
$an_array,
static function ( array &$row, int $col_idx ) use ( $ma