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  1. <?php
  2.  
  3. /**
  4.  * Project Euler Problem 1: Multiples of 3 and 5
  5.  * 
  6.  * If we list all the natural numbers below 10 that are multiples of 3 or 5, we
  7.  * get 3, 5, 6 and 9. The sum of these multiples is 23.
  8.  * 
  9.  * Find the sum of all the multiples of 3 or 5 below 1000.
  10.  * 
  11.  * Problem: https://p...content-available-to-author-only...r.net/problem=1
  12.  * Solution: https://g...content-available-to-author-only...b.com/potherca-blog/ProjectEuler/blob/master/src/PHP/Solutions/Problem001.php
  13.  * Live code: https://i...content-available-to-author-only...e.com/ViI6sA
  14.  */
  15. namespace Potherca\ProjectEuler\Solutions\Problem001
  16. {
  17.     use Potherca\ProjectEuler\Calculators\MultiplesCalculator as Calculator;
  18.  
  19.     $multiples = [3, 5];
  20.     $limit = 1000;
  21.  
  22.     $solutions = (new Calculator($multiples))->getSumOfMultiplesBelow($limit);
  23.  
  24.     echo $solutions;
  25. }
  26.  
  27. namespace Potherca\ProjectEuler\Calculators
  28. {
  29.     class MultiplesCalculator
  30.     {
  31.         private $multiples;
  32.  
  33.         final public function __construct(array $multiples)
  34.         {
  35.             $this->multiples = array_map(function ($multiple) {
  36.                 return (int) $multiple;
  37.             }, $multiples);
  38.         }
  39.  
  40.         final public function getMultiplesBelow(int $limit): array
  41.         {
  42.         	$multiples = [];
  43.  
  44.             for ($counter = 0 ; $counter < $limit; $counter++) {
  45.                 if ($this->isMultipleOf($this->multiples, $counter)) {
  46.                     $multiples[] = $counter;
  47.                 }
  48.             }
  49.  
  50.             return $multiples;
  51.         }
  52.  
  53.         final public function getSumOfMultiplesBelow(int $limit): int
  54.         {
  55.             return array_sum($this->getMultiplesBelow($limit));
  56.         }
  57.  
  58.         private function isMultipleOf(array $targets, int $subject): bool
  59.         {
  60.             return (bool) count(array_filter($targets, function ($target) use ($subject) {
  61.                 return $subject % $target === 0;
  62.             }));
  63.         }
  64.     }
  65. }
  66.  
Success #stdin #stdout 0.02s 24504KB
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https://ideone.com/ViI6sA
Solution in PHP for Project Euler Problem 001
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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