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- <?php
- /*
- * By adding type hints and enabling strict type checking, code can become
- * easier to read, self-documenting and reduce the number of potential bugs.
- * By default, type declarations are non-strict, which means they will attempt
- * to change the original type to match the type specified by the
- * type-declaration.
- *
- * In other words, if you pass a string to a function requiring a float,
- * it will attempt to convert the string value to a float.
- *
- * To enable strict mode, a single declare directive must be placed at the top
- * of the file.
- * This means that the strictness of typing is configured on a per-file basis.
- * This directive not only affects the type declarations of parameters, but also
- * a function's return type.
- *
- * For more info review the Concept on strict type checking in the PHP track
- * <link>.
- *
- * To disable strict typing, comment out the directive below.
- */
- declare(strict_types=1);
- class Allergies {
- /**
- * @var \Allergen[]
- */
- private array $allergies = [];
- public function __construct(int $score) {
- $score &= Allergen::CATS * 2 - 1;
- $id = Allergen::EGGS;
- while ($id <= Allergen::CATS) {
- if ($id & $score) {
- $this->allergies[] = new Allergen($id);
- }
- $id <<= 1;
- }
- }
- public function isAllergicTo(Allergen $allergen): bool {
- return in_array($allergen, $this->allergies);
- }
- /**
- * @return \Allergen[]
- */
- public function getList(): array {
- return $this->allergies;
- }
- }
- class Allergen {
- public const EGGS = 1;
- public const PEANUTS = 2;
- public const SHELLFISH = 4;
- public const STRAWBERRIES = 8;
- public const TOMATOES = 16;
- public const CHOCOLATE = 32;
- public const POLLEN = 64;
- public const CATS = 128;
- private int $id;
- public function __construct(int $id) {
- $this->id = $id;
- }
- public static function allergenList(): array {
- return [];
- }
- public function getScore(): int {
- return $this->id;
- }
- }
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