/**
* Return elapsed time between two datetimes in human readable format.
*
* @param datetime $start Initial datetime.
* @param datetime $end Final datetime (default is current time).
*
* @return string The formatted elapsed time.
*/
public static function timeBetween($start, $end = null)
{
// Convert datetimes to timestamps
$start = MiscUtils::datetime2timestamp($start);
$end = is_null($end) ? time() : MiscUtils::datetime2timestamp($end);
$SECOND = 1;
$MINUTE = 60 * $SECOND;
$HOUR = 60 * $MINUTE;
$DAY = 24 * $HOUR;
$WEEK = 7 * $DAY;
$MONTH = 30 * $DAY;
$YEAR = 365 * $DAY;
$increments = array(array($SECOND, 'second'), array($MINUTE, 'minute'), array($HOUR, 'hour'), array($DAY, 'day'), array($WEEK, 'week'), array($MONTH, 'month'), array($YEAR, 'year'));
$diff = $end - $start;
$plural = '';
$units = ceil($diff / $increments[count($increments) - 1][0]);
$unit = $increments[count($increments) - 1][1];
for ($i = 1; $i < count($increments); $i++) {
if ($increments[$i - 1][0] <= $diff && $diff < $increments[$i][0]) {
$units = ceil($diff / $increments[$i - 1][0]);
$unit = $increments[$i - 1][1];
break;
}
}
if ($units > 1) {
$plural = 's';
}
return sprintf("%d %s%s ago", $units, $unit, $plural);
}
