Human readable time difference between 2 dates in PHP

gistfile1.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
 * 
 * From: http://www.if-not-true-then-false.com/2010/php-calculate-real-differences-between-two-dates-or-timestamps/
 *
 * @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 get_date_diff( $time1, $time2, $precision = 2 ) {
	// If not numeric then convert timestamps
	if( !is_int( $time1 ) ) {
		$time1 = strtotime( $time1 );
	}
	if( !is_int( $time2 ) ) {
		$time2 = strtotime( $time2 );
	}

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

	// Set up intervals and diffs arrays
	$intervals = array( 'year', 'month', 'day', 'hour', 'minute', 'second' );
	$diffs = array();

	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 = array();
	foreach( $diffs as $interval => $value ) {
		// Break if we have needed precission
		if( $count >= $precision ) {
			break;
		}
		// Add value and interval if value is bigger than 0
		if( $value > 0 ) {
			if( $value != 1 ){
				$interval .= "s";
			}
			// Add value and interval to times array
			$times[] = $value . " " . $interval;
			$count++;
		}
	}

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

/**
Usage:

$t  = '2013-12-29T00:43:11+00:00';
$t2 = '2013-11-24 19:53:04 +0100';
  
var_dump( get_date_diff( $t, $t2, 1 ) ); // string '1 month' (length=7)
var_dump( get_date_diff( $t, $t2, 2 ) ); // string '1 month, 4 days' (length=15)
var_dump( get_date_diff( $t, $t2, 3 ) ); // string '1 month, 4 days, 5 hours' (length=24)

*/

Very helpful, thanks a lot.