Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
1 | <?php |
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11 | class JsonApiParser extends JsonParser |
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12 | { |
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13 | /** |
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14 | * Converts 'type' member to form name |
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15 | * If not set, type will be converted to singular form. |
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16 | * For example, 'articles' will be converted to 'Article' |
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17 | * @var callable |
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18 | */ |
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19 | public $formNameCallback = ['tuyakhov\jsonapi\Inflector', 'type2form']; |
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20 | |||
21 | /** |
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22 | * Converts member names to variable names |
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23 | * If not set, all special characters will be replaced by underscore |
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24 | * For example, 'first-name' will be converted to 'first_name' |
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25 | * @var callable |
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26 | */ |
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27 | public $memberNameCallback = ['tuyakhov\jsonapi\Inflector', 'member2var']; |
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28 | |||
29 | /** |
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30 | * Parse resource object into the input data to populates the model |
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31 | * @inheritdoc |
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32 | */ |
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33 | public function parse($rawBody, $contentType) |
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34 | { |
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35 | $array = parent::parse($rawBody, $contentType); |
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36 | if ($type = ArrayHelper::getValue($array, 'data.type')) { |
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37 | $formName = $this->typeToFormName($type); |
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38 | if ($attributes = ArrayHelper::getValue($array, 'data.attributes')) { |
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39 | $result[$formName] = array_combine($this->parseMemberNames(array_keys($attributes)), array_values($attributes)); |
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40 | } elseif ($id = ArrayHelper::getValue($array, 'data.id')) { |
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41 | $result[$formName] = ['id' => $id, 'type' => $type]; |
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42 | } |
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43 | if ($relationships = ArrayHelper::getValue($array, 'data.relationships')) { |
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44 | foreach ($relationships as $name => $relationship) { |
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45 | if (isset($relationship[0])) { |
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46 | View Code Duplication | foreach ($relationship as $item) { |
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47 | if (isset($item['type']) && isset($item['id'])) { |
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48 | $formName = $this->typeToFormName($item['type']); |
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49 | $result[$name][$formName][] = $item; |
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50 | } |
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51 | } |
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52 | } elseif (isset($relationship['type']) && isset($relationship['id'])) { |
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53 | $formName = $this->typeToFormName($relationship['type']); |
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54 | $result[$name][$formName] = $relationship; |
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55 | } |
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56 | } |
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57 | } |
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58 | } else { |
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59 | $data = ArrayHelper::getValue($array, 'data', []); |
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60 | View Code Duplication | foreach ($data as $relationLink) { |
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61 | if (isset($relationLink['type']) && isset($relationLink['id'])) { |
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62 | $formName = $this->typeToFormName($relationLink['type']); |
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63 | $result[$formName][] = $relationLink; |
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64 | } |
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65 | } |
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66 | } |
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67 | return isset($result) ? $result : $array; |
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68 | } |
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69 | |||
70 | /** |
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71 | * @param $type 'type' member of the document |
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72 | * @return string form name |
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73 | */ |
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74 | protected function typeToFormName($type) |
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78 | |||
79 | /** |
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80 | * @param array $memberNames |
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81 | * @return array variable names |
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82 | */ |
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83 | protected function parseMemberNames(array $memberNames = []) |
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87 | } |
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88 |
Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArray
is initialized the first time when the foreach loop is entered. You can also see that the value of thebar
key is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.