PHP: Calculate Difference Between Timestamps

PHP: Calculate Difference Between Timestamps

// DIFFERENCE BETWEEN TWO TIMESTAMPS
// Time format is UNIX timestamp or PHP strtotime compatible strings
function dateDiff($time1, $time2, $precision = 6)
{
    // If not numeric then convert texts to unix timestamps
    if (!is_int($time1)) {
        // $time1 = strtotime($time1);
    }
    if (!is_int($time2)) {
        // $time2 = strtotime($time2);
    }

    // If time1 is bigger than time2
    // Then swap time1 and time2
    if ($time1 > $time2) {
        $ttime = $time1;
        $time1 = $time2;
        $time2 = $ttime;
    }

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

    // Loop thru all intervals
    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();

    // Loop thru all diffs
    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 ($value > 0) {
            // Add s if value is not 1
            if ($value != 1) {
                $interval .= "s";
            }

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

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