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Edit File: DayOfMonthField.php

<?php
declare(strict_types=1);
namespace Cron;
if (!defined('ABSPATH')) exit;
use DateTime;
use DateTimeInterface;
class DayOfMonthField extends AbstractField
{
 protected $rangeStart = 1;
 protected $rangeEnd = 31;
 private static function getNearestWeekday(int $currentYear, int $currentMonth, int $targetDay): ?DateTime
 {
 $tday = str_pad((string) $targetDay, 2, '0', STR_PAD_LEFT);
 $target = DateTime::createFromFormat('Y-m-d', "{$currentYear}-{$currentMonth}-{$tday}");
 if ($target === false) {
 return null;
 }
 $currentWeekday = (int) $target->format('N');
 if ($currentWeekday < 6) {
 return $target;
 }
 $lastDayOfMonth = $target->format('t');
 foreach ([-1, 1, -2, 2] as $i) {
 $adjusted = $targetDay + $i;
 if ($adjusted > 0 && $adjusted <= $lastDayOfMonth) {
 $target->setDate($currentYear, $currentMonth, $adjusted);
 if ((int) $target->format('N') < 6 && (int) $target->format('m') === $currentMonth) {
 return $target;
 }
 }
 }
 return null;
 }
 public function isSatisfiedBy(DateTimeInterface $date, $value, bool $invert): bool
 {
 // ? states that the field value is to be skipped
 if ('?' === $value) {
 return true;
 }
 $fieldValue = $date->format('d');
 // Check to see if this is the last day of the month
 if ('L' === $value) {
 return $fieldValue === $date->format('t');
 }
 // Check to see if this is the nearest weekday to a particular value
 if ($wPosition = strpos($value, 'W')) {
 // Parse the target day
 $targetDay = (int) substr($value, 0, $wPosition);
 // Find out if the current day is the nearest day of the week
 $nearest = self::getNearestWeekday(
 (int) $date->format('Y'),
 (int) $date->format('m'),
 $targetDay
 );
 if ($nearest) {
 return $date->format('j') === $nearest->format('j');
 }
 throw new \RuntimeException('Unable to return nearest weekday');
 }
 return $this->isSatisfied((int) $date->format('d'), $value);
 }
 public function increment(DateTimeInterface &$date, $invert = false, $parts = null): FieldInterface
 {
 if (! $invert) {
 $date = $date->add(new \DateInterval('P1D'));
 $date = $date->setTime(0, 0);
 } else {
 $date = $date->sub(new \DateInterval('P1D'));
 $date = $date->setTime(23, 59);
 }
 return $this;
 }
 public function validate(string $value): bool
 {
 $basicChecks = parent::validate($value);
 // Validate that a list don't have W or L
 if (false !== strpos($value, ',') && (false !== strpos($value, 'W') || false !== strpos($value, 'L'))) {
 return false;
 }
 if (!$basicChecks) {
 if ('?' === $value) {
 return true;
 }
 if ('L' === $value) {
 return true;
 }
 if (preg_match('/^(.*)W$/', $value, $matches)) {
 return $this->validate($matches[1]);
 }
 return false;
 }
 return $basicChecks;
 }
}

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