Converts days to year, month, week and day.

days_to_string .php

<?php

function formatDays($days_value)
{
	$conditions = [
	      365 => 'Year',
	      30  => 'Month',
	      7   => 'Week',
	      1   => 'Day'
	];

	$result = null;
	foreach ($conditions as $days => $str) {

		$value = floor($days_value / $days);
		if ($value > 0) {
			$days_value = $days_value % $days;
			$result .= $value .' '. $str . ($value > 1 ? 's ' : ' ');
		}
	}

	return $result;
}

echo formatDays(30); // Output: 1 Month
echo formatDays(98); // Output: 3 Months 1 Week 1 Day
echo formatDays(830); // Output: 2 Years 3 Months 1 Week 3 Days