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<?php
class DateIntervalFormat
{
    /**
     * Format an interval value with the requested granularity.
     *
     * @param integer $timestamp The length of the interval in seconds.
     * @param integer $granularity How many different units to display in the string.
     * @return string A string representation of the interval.
     */
    public function getInterval($timestamp, $granularity = 2)
    {
        $seconds = time() - $timestamp;
        $units = array(
            '1 year|:count years' => 31536000,
            '1 week|:count weeks' => 604800,
            '1 day|:count days' => 86400,
            '1 hour|:count hours' => 3600,
            '1 min|:count min' => 60,
            '1 sec|:count sec' => 1);
        $output = '';
        foreach ($units as $key => $value) {
            $key = explode('|', $key);
            if ($seconds >= $value) {
                $count = floor($seconds / $value);
                $output .= ($output ? ' ' : '');
                $output .= ($count == 1) ? $key[0] : str_replace(':count', $count, $key[1]);
                $seconds %= $value;
                $granularity--;
            }
            if ($granularity == 0) {
                break;
            }
        }

return $output ? $output : '0 sec';
    }
}

$dateFormat = new DateIntervalFormat();
$timestamp = strtotime('2006-06-21 20:46:11');
print sprintf('Submitted %s ago',  $dateFormat->getInterval($timestamp));

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