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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| 5 | class ConfigGenerator |
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| 6 | { |
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| 7 | /** |
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| 8 | * Generate php source text. |
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| 9 | * |
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| 10 | * @param array $config |
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| 11 | * @param string $namespace |
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| 12 | * |
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| 13 | * @return static |
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| 14 | */ |
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| 15 | 3 | public static function generateText(array $config, $namespace = null) |
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| 21 | |||
| 22 | /** |
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| 23 | * @var string |
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| 24 | */ |
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| 25 | protected $text; |
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| 26 | |||
| 27 | /** |
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| 28 | * @var int |
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| 29 | */ |
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| 30 | protected $indent; |
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| 31 | |||
| 32 | /** |
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| 33 | * Generate php source text. |
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| 34 | * |
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| 35 | * @param array $config |
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| 36 | * @param string $namespace |
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| 37 | * |
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| 38 | * @return string |
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| 39 | */ |
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| 40 | 5 | public function generate(array $config, $namespace = null) |
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| 58 | |||
| 59 | /** |
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| 60 | * Generate php array elements |
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| 61 | * |
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| 62 | * @param array $config |
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| 63 | */ |
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| 64 | 5 | private function generateArray(array $config) |
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| 114 | |||
| 115 | /** |
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| 116 | * Write a source line. |
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| 117 | * |
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| 118 | * @param string $line |
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| 119 | */ |
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| 120 | 5 | private function writeLine($line) |
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| 126 | } |
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| 127 |
In PHP, under loose comparison (like
==, or!=, orswitchconditions), values of different types might be equal.For
stringvalues, the empty string''is a special case, in particular the following results might be unexpected: