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 Comment_Meta_Container extends Container { |
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| 12 | protected $comment_id; |
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| 13 | |||
| 14 | /** |
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| 15 | * Create a new comment meta container |
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| 16 | * |
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| 17 | * @param string $title Unique title of the container |
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| 18 | **/ |
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| 19 | public function __construct( $title ) { |
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| 26 | |||
| 27 | /** |
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| 28 | * Perform instance initialization after calling setup() |
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| 29 | **/ |
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| 30 | public function init() { |
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| 38 | |||
| 39 | /** |
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| 40 | * Checks whether the current request is valid |
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| 41 | * |
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| 42 | * @return bool |
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| 43 | **/ |
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| 44 | public function is_valid_save() { |
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| 51 | |||
| 52 | /** |
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| 53 | * Add meta box to the comment |
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| 54 | **/ |
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| 55 | public function attach() { |
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| 65 | |||
| 66 | /** |
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| 67 | * Revert the result of attach() |
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| 68 | **/ |
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| 69 | View Code Duplication | public function detach() { |
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| 80 | |||
| 81 | /** |
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| 82 | * Output the container markup |
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| 83 | **/ |
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| 84 | public function render() { |
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| 87 | |||
| 88 | /** |
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| 89 | * Set the comment ID the container will operate with. |
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| 90 | * |
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| 91 | * @param int $comment_id |
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| 92 | **/ |
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| 93 | public function set_comment_id( $comment_id ) { |
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| 97 | |||
| 98 | /** |
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| 99 | * Perform save operation after successful is_valid_save() check. |
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| 100 | * The call is propagated to all fields in the container. |
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| 101 | * |
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| 102 | * @param int $comment_id ID of the comment against which save() is ran |
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| 103 | **/ |
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| 104 | public function save( $comment_id ) { |
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| 116 | |||
| 117 | /** |
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| 118 | * Perform checks whether there is a field registered with the name $name. |
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| 119 | * If not, the field name is recorded. |
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| 120 | * |
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| 121 | * @param string $name |
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| 122 | **/ |
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| 123 | public function verify_unique_field_name( $name ) { |
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| 134 | |||
| 135 | /** |
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| 136 | * Remove field name $name from the list of unique field names |
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| 137 | * |
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| 138 | * @param string $name |
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| 139 | **/ |
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| 140 | public function drop_unique_field_name( $name ) { |
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| 146 | |||
| 147 | } |