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  1. <?php
  2.  
  3. $dateTime = DateTime::createFromFormat('d M Y', '12 Dec 2016');
  4.  
  5. function getWorkingDayAfterNDays(DateTime $dateTime, $n) {
  6.     if ($n < 0) {
  7.         throw new Exception("Число должно быть положительным {$n}");
  8.     }
  9.  
  10.     while (true) {
  11.         $dateTime->modify('+1 day');
  12.         if (isWorkingDay($dateTime)) {
  13.             $n--;
  14.             if ($n === 0) {
  15.                 return $dateTime;
  16.             }
  17.         }
  18.     }
  19. }
  20.  
  21. function isWorkingDay(DateTime $dateTime) {
  22.     $workDays = [
  23.         '19-12-16',
  24.         '20-12-16',
  25.         '23-12-16',
  26.         '24-12-16',
  27.         '25-12-16',
  28.         '26-12-16',
  29.     ];
  30.  
  31.     return in_array($dateTime->format('d-m-y'), $workDays);
  32. }
  33.  
  34. var_dump(getWorkingDayAfterNDays($dateTime, 5));
  35.  
Success #stdin #stdout 0.01s 52488KB
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object(DateTime)#1 (3) {
  ["date"]=>
  string(26) "2016-12-25 22:21:19.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "UTC"
}
https://ideone.com/go0Mfo
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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