TimeUtils.php

<?php

declare(strict_types=1);

class TimeUtils{
	public const YEAR = self::DAY * 365;
	public const MONTH = self::DAY * 30;
	public const WEEK = self::DAY * 7;
	public const DAY = self::HOUR * 24;
	public const HOUR = self::MIN * 60;
	public const MIN = self::SEC * 60;
	public const SEC = 1;

	/**
	 * @param int  $time
	 * @param bool $accusative (винительный падеж, используйте перед словом "через")
	 * @return string
	 */
	public static function timestamp2word(int $time, bool $accusative = true) : string{
		$result = "";
		if(($year = (int) ($time / self::YEAR)) > 0){
			$time -= $year * self::YEAR;
			$result .= self::rightTimeCase($year, self::YEAR, $accusative);
		}
		if(($month = (int) ($time / self::MONTH)) > 0){
			$time -= $month * self::MONTH;
			$result .= self::rightTimeCase($month, self::MONTH, $accusative);
		}
		if(($week = (int) ($time / self::WEEK)) > 0){
			$time -= $week * self::WEEK;
			$result .= self::rightTimeCase($week, self::WEEK, $accusative);
		}
		if(($day = (int) ($time / self::DAY)) > 0){
			$time -= $day * self::DAY;
			$result .= self::rightTimeCase($day, self::DAY, $accusative);
		}
		if(($hour = (int) ($time / self::HOUR)) > 0){
			$time -= $hour * self::HOUR;
			$result .= self::rightTimeCase($hour, self::HOUR, $accusative);
		}
		if(($min = (int) ($time / self::MIN)) > 0){
			$time -= $min * self::MIN;
			$result .= self::rightTimeCase($min, self::MIN, $accusative);
		}
		if($time > 0){
			$min < 0 ?: $result .= "и ";
			$result .= self::rightTimeCase($time, self::SEC, $accusative);
		}
		return $result;
	}

	/**
	 * @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 int  $type
	 * @param bool $accusative
	 * @return string
	 */
	public static function rightTimeCase(int $time, int $type, bool $accusative = true) : string{
		$cases = [
			self::YEAR => ["год", "года", "лет"],
			self::MONTH => ["месяц", "месяца", "месяцев"],
			self::WEEK => [$accusative ? "неделю" : "неделя", "недели", "недель"],
			self::DAY => ["день", "дня", "дней"],
			self::HOUR => ["час", "часа", "часов"],
			self::MIN => [$accusative ? "минуту" : "минута", "минуты", "минут"],
			self::SEC => [$accusative ? "секунду" : "секунда", "секунды", "секунд"]
		];
		return self::correctForm($time, $cases[$type]) . " ";
	}
}

/**
 * Examples
 */

echo "Вытащите пирог из духовки через " . TimeUtils::timestamp2word(1251) . PHP_EOL;

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