public static function create($years = null, $months = null, $weeks = null, $days = null, $hours = null, $minutes = null, $seconds = null)
{
// Build the date interval specification string
$dateIntervalSpec = DateInterval::PERIOD_PREFIX;
// Check whether the weeks parameter is used, append the number of days
if (!empty($weeks)) {
$days += (int) ($weeks * DateTime::DAYS_PER_WEEK);
}
// Reading all non-zero date parts
$date = array_filter(array(DateInterval::PERIOD_YEARS => $years, DateInterval::PERIOD_MONTHS => $months, DateInterval::PERIOD_DAYS => $days));
// Reading all non-zero time parts
$time = array_filter(array(DateInterval::PERIOD_HOURS => $hours, DateInterval::PERIOD_MINUTES => $minutes, DateInterval::PERIOD_SECONDS => $seconds));
// Make sure at least one part is available
if (empty($date) && empty($time)) {
$date = array(DateInterval::PERIOD_YEARS => 0);
}
// Append each date part to the specification string
foreach ($date as $key => $value) {
$dateIntervalSpec .= $value . $key;
}
// Append each time part to the specification string if available
if (!empty($time)) {
// Prefix the time designator
$dateIntervalSpec .= DateInterval::PERIOD_TIME_PREFIX;
// Append each time part to the specification string
foreach ($time as $key => $value) {
$dateIntervalSpec .= $value . $key;
}
}
// Return the spec if it's valid, return null otherwise
return DateIntervalSpecUtils::isValid($dateIntervalSpec) ? $dateIntervalSpec : null;
}
/**
* Parse a date interval. A new instance may be created.
*
* This method allows better fluent syntax because it makes method chaining possible.
*
* @param PHPDateInterval|PHPDateInterval|string|null $dateInterval [optional] A DateInterval or PHPDateInterval
* instance, a date interval specification, or null to use a zero specification.
*
* @return static A DateInterval instance, or null on failure.
*/
public static function parse($dateInterval)
{
// Return the object if it's already a DateInterval instance
if ($dateInterval instanceof self) {
return $dateInterval;
}
// Parse PHPDateInterval objects
if ($dateInterval instanceof parent) {
return new static($dateInterval, $dateInterval->invert);
}
// Return a zero specification if the specification is set to null
if ($dateInterval === null) {
return static::createZero();
}
// Try to parse the string as date interval specification, return null on failure
if (($dateIntervalSpec = DateIntervalSpecUtils::parse($dateInterval, null)) !== null) {
// Create and return a new date interval instance based on the parsed specification
return new static($dateIntervalSpec);
}
// Couldn't parse the date interval instance, return null
return null;
}