class Program {

	private string center_text(string $word){
		int $tot_width = 30;
		char $symbol = '-';
		int $middle = (int) round($tot_width/2);
		int $length_word = strlen($word);
		int $middle_word = (int) round($length_word / 2);
		int $last_position = $middle + $middle_word;
		int $number_of_spaces = $middle - $middle_word;
		string $result = sprintf("%'{$symbol}{$last_position}s", $word);
		for(int $i = 0; $i < $number_of_spaces; $i++) {
			$result += "$symbol";
		}
		return $result;
	}

	public void main() {
		string $str = 'Example text';
		print($this->center_text($str));
	}

}