Get human-readable time difference between 2 dates [German]

human-date-difference.php

<?php
/**
 * Get human-readable time difference between 2 dates
 *
 * Return difference between 2 dates in year, month, hour, minute or second
 * The $precision caps the number of time units used: for instance if
 * $time1 - $time2 = 3 days, 4 hours, 12 minutes, 5 seconds
 * - with precision = 1 : 3 days
 * - with precision = 2 : 3 days, 4 hours
 * - with precision = 3 : 3 days, 4 hours, 12 minutes
 *
 * Original from: http://www.if-not-true-then-false.com/2010/php-calculate-real-differences-between-two-dates-or-timestamps/
 *
 * Usage:
 * $t  = '2013-12-29T00:43:11+00:00';
 * $t2 = '2013-11-24 19:53:04 +0100';
 *
 * var_dump( $this->GetTimeBetweenInHuman( $t, $t2, 1 ) ); // string '1 month' (length=7)
 * var_dump( $this->GetTimeBetweenInHuman( $t, $t2, 2 ) ); // string '1 month, 4 days' (length=15)
 * var_dump( $this->GetTimeBetweenInHuman( $t, $t2, 3 ) ); // string '1 month, 4 days, 5 hours' (length=24)
 *
 * @param mixed $time1 a time (string or timestamp)
 * @param mixed $time2 a time (string or timestamp)
 * @param integer $precision Optional precision
 * @return string time difference
 */
function GetTimeBetweenInHuman(mixed $time1, mixed $time2, int $precision = 2 ): string
{
	// If not numeric then convert timestamps
	if( !is_int( $time1 ) )
	{
		$time1 = strtotime( $time1 );
	}
	if( !is_int( $time2 ) )
	{
		$time2 = strtotime( $time2 );
	}

	$_replaces = [
		'year' => 'Jahr',
		'month' => 'Monat',
		'day' => 'Tag',
		'hour' => 'Stunde',
		'minute' => 'Minute',
		'second' => 'Sekunde',
	];

	// If time1 > time2 then swap the 2 values
	if( $time1 > $time2 )
	{
		list( $time1, $time2 ) = [$time2, $time1];
	}

	// Set up intervals and diffs arrays
	$intervals = ['year', 'month', 'day', 'hour', 'minute', 'second'] ;
	$diffs = [];

	foreach( $intervals as $interval )
	{
		// Create temp time from time1 and interval
		$ttime = strtotime( '+1 ' . $interval, $time1 );
		// Set initial values
		$add = 1;
		$looped = 0;

		// Loop until temp time is smaller than time2
		while ( $time2 >= $ttime )
		{
			// Create new temp time from time1 and interval
			$add++;
			$ttime = strtotime( "+" . $add . " " . $interval, $time1 );
			$looped++;
		}

		$time1 = strtotime( "+" . $looped . " " . $interval, $time1 );
		$diffs[ $interval ] = $looped;
	}

	$count = 0;
	$times = [];

	foreach( $diffs as $interval => $value )
	{
		// Break if we have needed precission
		if( $count >= $precision ) {
			break;
		}

		$interval = str_replace(array_keys($_replaces), array_values($_replaces), $interval);

		// Add value and interval if value is bigger than 0
		if( $value > 0 )
		{
			if( $value != 1 )
			{
				if($interval == 'Jahr' || $interval == 'Monat' || $interval == 'Tag')
				{
					$interval .= "e";
				}
				else {
					$interval .= "n";
				}
			}

			// Add value and interval to times array
			$times[] = $value . " " . $interval;
			$count++;
		}
	}

	// Return string with times
	return implode( ", ", $times );
}