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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| 25 | class MailingList extends HttpApi |
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| 26 | { |
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| 27 | public function member(): Member |
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| 31 | |||
| 32 | /** |
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| 33 | * Returns a paginated list of mailing lists on the domain. |
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| 34 | * |
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| 35 | * @param int $limit Maximum number of records to return (optional: 100 by default) |
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| 36 | * |
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| 37 | * @return PagesResponse |
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| 38 | * |
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| 39 | * @throws \Exception |
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| 40 | */ |
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| 41 | 2 | View Code Duplication | public function pages(int $limit = 100) |
| 53 | |||
| 54 | /** |
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| 55 | * Creates a new mailing list on the current domain. |
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| 56 | * |
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| 57 | * @param string $address Address for the new mailing list |
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| 58 | * @param string $name Name for the new mailing list (optional) |
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| 59 | * @param string $description Description for the new mailing list (optional) |
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| 60 | * @param string $accessLevel List access level, one of: readonly (default), members, everyone |
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| 61 | * |
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| 62 | * @return CreateResponse |
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| 63 | * |
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| 64 | * @throws \Exception |
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| 65 | */ |
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| 66 | 3 | public function create(string $address, string $name = null, string $description = null, string $accessLevel = 'readonly') |
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| 84 | |||
| 85 | /** |
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| 86 | * Returns a single mailing list. |
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| 87 | * |
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| 88 | * @param string $address Address of the mailing list |
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| 89 | * |
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| 90 | * @return ShowResponse |
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| 91 | * |
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| 92 | * @throws \Exception |
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| 93 | */ |
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| 94 | 2 | public function show(string $address) |
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| 102 | |||
| 103 | /** |
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| 104 | * Updates a mailing list. |
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| 105 | * |
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| 106 | * @param string $address Address of the mailing list |
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| 107 | * @param array $parameters Array of field => value pairs to update |
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| 108 | * |
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| 109 | * @return UpdateResponse |
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| 110 | * |
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| 111 | * @throws \Exception |
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| 112 | */ |
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| 113 | 2 | public function update(string $address, array $parameters = []) |
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| 137 | |||
| 138 | /** |
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| 139 | * Removes a mailing list from the domain. |
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| 140 | * |
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| 141 | * @param string $address Address of the mailing list |
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| 142 | * |
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| 143 | * @return DeleteResponse |
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| 144 | * |
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| 145 | * @throws \Exception |
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| 146 | */ |
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| 147 | 1 | public function delete(string $address) |
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| 155 | } |
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| 156 |
Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: