| 1 | <?php |
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| 20 | abstract class BaseEnum extends BaseTypeDefinition implements EnumDefinition |
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| 21 | { |
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| 22 | use BaseDirectivesContainer; |
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| 23 | |||
| 24 | /** |
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| 25 | * Enum type name |
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| 26 | */ |
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| 27 | protected const TYPE_NAME = Type::ENUM; |
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| 28 | |||
| 29 | /** |
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| 30 | * @var array|ValueDefinition[] |
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| 31 | */ |
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| 32 | protected $values = []; |
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| 33 | |||
| 34 | /** |
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| 35 | * @param mixed|string $value |
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| 36 | * @return bool |
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| 37 | */ |
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| 38 | 168 | public function isCompatible($value): bool |
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| 42 | |||
| 43 | /** |
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| 44 | * @return iterable|ValueDefinition[] |
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| 45 | */ |
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| 46 | 5438 | public function getValues(): iterable |
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| 50 | |||
| 51 | /** |
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| 52 | * @param string $name |
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| 53 | * @return bool |
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| 54 | */ |
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| 55 | 126 | public function hasValue(string $name): bool |
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| 59 | |||
| 60 | /** |
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| 61 | * @param string $name |
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| 62 | * @return null|ValueDefinition |
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| 63 | */ |
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| 64 | 6 | public function getValue(string $name): ?ValueDefinition |
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| 68 | |||
| 69 | /** |
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| 70 | * @return array |
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| 71 | */ |
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| 72 | 1004 | public function __sleep(): array |
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| 82 | } |
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| 83 |
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.