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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| 13 | class CheckInValidator extends Object |
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| 14 | { |
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| 15 | const MESSAGE_NO_CODE = 'MESSAGE_NO_CODE'; |
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| 16 | const MESSAGE_CODE_NOT_FOUND = 'MESSAGE_CODE_NOT_FOUND'; |
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| 17 | const MESSAGE_TICKET_CANCELLED = 'MESSAGE_TICKET_CANCELLED'; |
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| 18 | const MESSAGE_ALREADY_CHECKED_IN = 'MESSAGE_ALREADY_CHECKED_IN'; |
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| 19 | const MESSAGE_CHECK_OUT_SUCCESS = 'MESSAGE_CHECK_OUT_SUCCESS'; |
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| 20 | const MESSAGE_CHECK_IN_SUCCESS = 'MESSAGE_CHECK_IN_SUCCESS'; |
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| 21 | |||
| 22 | const MESSAGE_TYPE_GOOD = 'Good'; |
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| 23 | const MESSAGE_TYPE_WARNING = 'Warning'; |
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| 24 | const MESSAGE_TYPE_BAD = 'Bad'; |
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| 25 | |||
| 26 | /** |
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| 27 | * Allow people to check in and out |
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| 28 | * |
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| 29 | * @config |
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| 30 | * @var bool |
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| 31 | */ |
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| 32 | private static $allow_checkout = false; |
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| 33 | |||
| 34 | /** |
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| 35 | * @var Attendee |
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| 36 | */ |
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| 37 | protected $attendee = null; |
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| 38 | |||
| 39 | /** |
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| 40 | * Validate the given ticket code |
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| 41 | * |
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| 42 | * @param null|string $ticketCode |
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| 43 | * |
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| 44 | * @return array |
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| 45 | */ |
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| 46 | public function validate($ticketCode = null) { |
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| 100 | |||
| 101 | /** |
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| 102 | * Get the attendee instance |
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| 103 | * |
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| 104 | * @return Attendee |
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| 105 | */ |
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| 106 | public function getAttendee() |
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| 110 | |||
| 111 | /** |
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| 112 | * Translate the given type to a readable message |
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| 113 | * |
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| 114 | * @param $message string |
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| 115 | * |
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| 116 | * @return string |
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| 117 | */ |
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| 118 | private static function message($message) { |
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| 121 | } |
This check marks private properties in classes that are never used. Those properties can be removed.