| 1 | <?php |
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| 16 | class CreateChargeRequest implements RequestInterface |
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| 17 | { |
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| 18 | /** |
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| 19 | * Default endpoint (Uri in Guzzle context) |
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| 20 | */ |
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| 21 | const ENDPOINT = 'charges/v1'; |
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| 22 | /** |
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| 23 | * @var Charge |
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| 24 | */ |
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| 25 | private $charge; |
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| 26 | |||
| 27 | /** |
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| 28 | * CreateChargeRequest constructor. |
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| 29 | */ |
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| 30 | 3 | public function __construct(Charge $charge) |
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| 34 | |||
| 35 | |||
| 36 | /** |
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| 37 | * Return the uri |
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| 38 | * |
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| 39 | * @return string The uri |
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| 40 | */ |
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| 41 | 1 | public function getEndpoint() |
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| 45 | |||
| 46 | /** |
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| 47 | * Return request method |
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| 48 | * |
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| 49 | * @return string This is the request type |
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| 50 | */ |
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| 51 | 1 | public function getRequestMethod() |
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| 55 | |||
| 56 | |||
| 57 | /** |
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| 58 | * Retrieve the whole request |
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| 59 | * |
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| 60 | * @return string[] The complete request |
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| 61 | */ |
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| 62 | 1 | public function getPayload() |
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| 66 | } |
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| 67 |
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.