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<?php |
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namespace iansltx\BusinessDays; |
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/** |
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* Class StaticFilter |
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* |
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* A library of static filter functions that can be used directly |
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* |
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* @package iansltx\BusinessDays |
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*/ |
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class StaticFilter |
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{ |
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protected static $easterByYear = []; // cache of Easter DateTimeImmutable objects, indexed by year |
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/** |
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* Returns true if $dt is on a Saturday or Sunday, false otherwise |
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* |
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* @param \DateTimeInterface $dt |
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* @return bool |
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*/ |
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public static function isWeekend(\DateTimeInterface $dt) |
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{ |
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return in_array($dt->format('w'), [0, 6]); |
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} |
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/** |
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* Returns true if $dt is the Monday after Western Easter, false otherwise |
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* |
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* @param \DateTimeInterface $dt |
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* @return bool |
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*/ |
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public static function isEasterMonday(\DateTimeInterface $dt) |
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{ |
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$easterMonday = static::getEasterDateTimeForYear($dt->format('Y'))->add(new \DateInterval('P1D')); |
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return $easterMonday->format('m') === $dt->format('m') && $easterMonday->format('d') === $dt->format('d'); |
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} |
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/** |
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* Returns true if $dt is the Friday before Western Easter, false otherwise |
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* |
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* @param \DateTimeInterface $dt |
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* @return bool |
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*/ |
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public static function isGoodFriday(\DateTimeInterface $dt) |
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{ |
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$goodFriday = static::getEasterDateTimeForYear($dt->format('Y'))->sub(new \DateInterval('P2D')); |
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return $goodFriday->format('m') === $dt->format('m') && $goodFriday->format('d') === $dt->format('d'); |
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} |
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/** |
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* Gets an immutable DateTime object set to midnight UTC of Western Easter |
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* for a given year. Built because HHVM doesn't include easter_date() or |
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* easter_day(). Credit to https://www.drupal.org/node/1180480 for the |
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* original implementation. |
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* |
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* To get a runtime-agnostic result comparable to PHP4+'s easter_date(), |
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* call getTimestamp() on the returned value of this function. |
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* |
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* @param int $year |
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* @return \DateTimeImmutable |
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*/ |
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public static function getEasterDateTimeForYear($year) { |
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if (!isset(static::$easterByYear[$year])) { // build cached value if it doesn't exist |
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4 |
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$century = intval($year / 100); |
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$centuryOverFour = intval($century / 4); |
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$centuryMod4 = $century % 4; |
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$twoDigitYear = $year % 100; |
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$twoDigitYearOver4 = intval($twoDigitYear / 4); |
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$twoDigitYearMod4 = $twoDigitYear % 4; |
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$yearMod19 = $year % 19; |
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$interF = intval(($century + 8) / 25); |
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$interG = intval(($century - $interF + 1) / 3); |
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$interH = (19 * $yearMod19 + $century - $centuryOverFour - $interG + 15) % 30; |
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$interL = (32 + 2 * $centuryMod4 + 2 * $twoDigitYearOver4 - $interH - $twoDigitYearMod4) % 7; |
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$interM = intval(($yearMod19 + 11 * $interH + 22 * $interL) / 451); |
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$interP = ($interH + $interL - 7 * $interM + 114) % 31; |
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$monthNumber = intval(($interH + $interL - 7 * $interM + 114) / 31); |
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$day = $interP + 1; |
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static::$easterByYear[$year] = \DateTimeImmutable::createFromFormat( |
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'Y-m-d', $year . '-' . $monthNumber . '-' . $day, new \DateTimeZone('UTC')); |
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} |
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return static::$easterByYear[$year]; // return cached value |
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} |
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} |
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iansltx /
BusinessDays
