1 | <?php |
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22 | class Quote implements QuoteInterface { |
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23 | |||
24 | /** |
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25 | * Author. |
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26 | * |
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27 | * @var string |
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28 | */ |
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29 | private $author; |
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30 | |||
31 | /** |
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32 | * Content. |
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33 | * |
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34 | * @var string |
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35 | */ |
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36 | private $content; |
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37 | |||
38 | /** |
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39 | * Date. |
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40 | * |
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41 | * @var DateTime |
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42 | */ |
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43 | private $date; |
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44 | |||
45 | /** |
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46 | * Constructor. |
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47 | */ |
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48 | public function __construct() { |
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51 | |||
52 | /** |
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53 | * {@inheritdoc} |
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54 | */ |
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55 | public function getAuthor() { |
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58 | |||
59 | /** |
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60 | * {@inheritdoc} |
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61 | */ |
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62 | public function getContent() { |
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65 | |||
66 | /** |
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67 | * {@inheritdoc} |
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68 | */ |
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69 | public function getDate() { |
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72 | |||
73 | /** |
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74 | * Set the author. |
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75 | * |
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76 | * @param string $author The author. |
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77 | * @return Quote Returns this quote. |
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78 | */ |
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79 | public function setAuthor($author) { |
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83 | |||
84 | /** |
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85 | * Set the content. |
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86 | * |
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87 | * @param string $content The content. |
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88 | * @return Quote Returns this quote. |
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89 | */ |
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90 | public function setContent($content) { |
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94 | |||
95 | /** |
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96 | * Set the date. |
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97 | * |
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98 | * @param DateTime $date The date. |
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99 | * @return Quote Returns this quote. |
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100 | */ |
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101 | public function setDate(DateTime $date = null) { |
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105 | } |
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106 |
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_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.