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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| 14 | View Code Duplication | class Chanel extends \Model { | 
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| 15 | |||
| 16 | static $cols = [  | 
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| 17 | 'name' => ['type' => 'text'],  | 
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| 18 | 'alias' => ['type' => 'text'],  | 
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| 19 | 'path' => ['type' => 'text'],  | 
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| 20 | 'parent_id' => ['type' => 'select', 'source' => 'relation', 'relation' => 'parent'],  | 
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| 21 | 'date_create' => ['type' => 'dateTime']  | 
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| 22 | ];  | 
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| 23 | |||
| 24 |     static function relations() { | 
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| 32 | }  | 
            
The PSR-2 coding standard requires that all properties in a class have their visibility explicitly declared. If you declare a property using
the property is implicitly global.
To learn more about the PSR-2, please see the PHP-FIG site on the PSR-2.