TimeUtils.php

<?php

declare(strict_types=1);

namespace converter;

use function intdiv;
use function min;

class TimeUtils{
	//@formatter:off
	public const YEAR  = 31536000;
	public const MONTH = 2592000;
	public const WEEK  = 604800;
	public const DAY   = 86400;
	public const HOUR  = 3600;
	public const MIN   = 60;
	public const SEC   = 1;

	private const UNITS_OF_TIME = [self::YEAR, self::MONTH, self::WEEK, self::DAY, self::HOUR, self::MIN, self::SEC];

	private const NOMINATIVE_CASE = [
		self::YEAR  => ['год', 'года', 'лет'],
		self::MONTH => ['месяц', 'месяца', 'месяцев'],
		self::WEEK  => ['неделя', 'недели', 'недель'],
		self::DAY   => ['день', 'дня', 'дней'],
		self::HOUR  => ['час', 'часа', 'часов'],
		self::MIN   => ['минута', 'минуты', 'минут'],
		self::SEC   => ['секунда', 'секунды', 'секунд']
	];

	private const ACCUSATIVE_CASE = [
		self::YEAR  => self::NOMINATIVE_CASE[self::YEAR],
		self::MONTH => self::NOMINATIVE_CASE[self::MONTH],
		self::WEEK  => ['неделю', 'недели', 'недель'],
		self::DAY   => self::NOMINATIVE_CASE[self::DAY],
		self::HOUR  => self::NOMINATIVE_CASE[self::HOUR],
		self::MIN   => ['минуту', 'минуты', 'минут'],
		self::SEC   => ['секунду', 'секунды', 'секунд']
	];
	//@formatter:on

	/**
	 * @param int   $number
	 * @param array $format [1, 2, 5]
	 *
	 * @return string
	 */
	public static function correctForm(int $number, array $format) : string{
		return $number . ' ' . $format[($number % 100 > 4 && $number % 100 < 20) ? 2 : [2, 0, 1, 1, 1, 2][min($number % 10, 5)]];
	}

	/**
	 * @param int  $time
	 * @param bool $accusative (винительный падеж, используйте перед словом "через")
	 *
	 * @return string
	 */
	public static function timestamp2word(int $time, bool $accusative = true) : string{
		$result = '';
		$case = $accusative ? self::ACCUSATIVE_CASE : self::NOMINATIVE_CASE;
		$it = 0;
		foreach(self::UNITS_OF_TIME as $unit){
			if(($perUnit = intdiv($time, $unit)) > 0){
				$time -= $perUnit * $unit;
				if(($lastUnit = $time === 0) && $it > 0){
					$result .= 'и ';
				}
				$result .= self::correctForm($perUnit, $case[$unit]) . ($lastUnit ? '' : ' ');
				$it++;
			}
		}
		return $result;
	}
}

/**
 * Examples
 */

echo 'Вытащите пирог из духовки через ' . TimeUtils::timestamp2word(61) . PHP_EOL;

$newYear = (mktime(0, 0, 0, 1, 1, date('Y') + 1) - time());
echo 'До нового года осталось: ' . TimeUtils::timestamp2word($newYear, false) . PHP_EOL;