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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10 | class Field |
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11 | { |
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12 | protected $table; |
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13 | protected $name; |
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14 | protected $config = []; |
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15 | |||
16 | /** |
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17 | * @param Table $table |
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18 | * @param string $name |
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19 | */ |
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20 | public function __construct(Table $table, $name) |
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25 | |||
26 | /** |
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27 | * Converts the data to save in the database |
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28 | * |
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29 | * @param mixed $data |
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30 | * |
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31 | * @return mixed |
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32 | */ |
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33 | public function dataToDatabase($data) |
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41 | |||
42 | /** |
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43 | * Converts the data to be used |
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44 | * |
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45 | * @param mixed $data |
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46 | * |
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47 | * @return mixed |
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48 | */ |
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49 | public function dataFromDatabase($data) |
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53 | |||
54 | /** |
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55 | * Returns the field scheme |
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56 | * |
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57 | * @return array |
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58 | */ |
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59 | public function getScheme() |
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63 | |||
64 | /** |
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65 | * Returns the expression used to get the value from the database |
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66 | * |
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67 | * @param string|null $as |
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68 | * |
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69 | * @return string |
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70 | */ |
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71 | View Code Duplication | public function getSelectExpression($as = null) |
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82 | |||
83 | /** |
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84 | * Returns the expression used to save the value in the database |
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85 | * |
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86 | * @param string $mark |
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87 | * |
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88 | * @return string |
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89 | */ |
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90 | public function getValueExpression($mark) |
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94 | |||
95 | /** |
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96 | * Returns a config value |
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97 | * |
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98 | * @return mixed |
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99 | */ |
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100 | public function getConfig($name) |
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104 | |||
105 | /** |
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106 | * Edit a config value |
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107 | * |
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108 | * @param string $name |
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109 | * @param mixed $value |
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110 | * |
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111 | * @return self |
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112 | */ |
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113 | public function setConfig($name, $value) |
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119 | } |
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120 |
In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: