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 ImagesWithStyleSelection extends DataObject  | 
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| 6 | { | 
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| 7 | |||
| 8 | |||
| 9 | #######################  | 
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| 10 | ### Names Section  | 
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| 11 | #######################  | 
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| 12 | |||
| 13 | private static $singular_name = 'Selection of Images';  | 
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| 14 | |||
| 15 | public function i18n_singular_name()  | 
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| 19 | |||
| 20 | private static $plural_name = 'Selections of Images';  | 
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| 21 | |||
| 22 | public function i18n_plural_name()  | 
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| 26 | |||
| 27 | |||
| 28 | #######################  | 
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| 29 | ### Model Section  | 
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| 30 | #######################  | 
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| 31 | |||
| 32 | private static $db = [  | 
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| 33 | 'Title' => 'Varchar(255)', // this needs to be lengthy to avoid the same names ...  | 
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| 34 | 'Description' => 'Text'  | 
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| 35 | ];  | 
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| 36 | |||
| 37 | private static $has_one = [  | 
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| 38 | 'PlaceToStoreImages' => 'Folder'  | 
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| 39 | ];  | 
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| 40 | |||
| 41 | private static $many_many = [  | 
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| 42 | 'StyledImages' => 'ImageWithStyle'  | 
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| 43 | ];  | 
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| 44 | |||
| 45 | private static $many_many_extraFields = [  | 
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| 46 | 'StyledImages' => [  | 
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| 47 | 'SortOrder' => 'Int',  | 
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| 48 | ]  | 
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| 49 | ];  | 
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| 50 | |||
| 51 | public function StyledImages()  | 
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| 55 | |||
| 56 | #######################  | 
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| 57 | ### Further DB Field Details  | 
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| 58 | #######################  | 
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| 59 | |||
| 60 | private static $indexes = [  | 
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| 61 | 'Created' => true,  | 
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| 62 |         'Title' => 'unique("Title")' | 
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| 63 | ];  | 
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| 64 | |||
| 65 | private static $defaults = [  | 
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| 66 | 'Title' => ''  | 
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| 67 | ];  | 
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| 68 | |||
| 69 | private static $default_sort = [  | 
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| 70 | 'Created' => 'DESC'  | 
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| 71 | ];  | 
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| 72 | |||
| 73 | private static $required_fields = [  | 
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| 74 | 'Title'  | 
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| 75 | ];  | 
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| 76 | |||
| 77 | private static $searchable_fields = [  | 
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| 78 | 'Title' => 'PartialMatchFilter'  | 
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| 79 | ];  | 
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| 80 | |||
| 81 | |||
| 82 | #######################  | 
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| 83 | ### Field Names and Presentation Section  | 
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| 84 | #######################  | 
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| 85 | |||
| 86 | private static $field_labels = [  | 
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| 87 | 'StyledImages' => 'Images to be included'  | 
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| 88 | ];  | 
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| 89 | |||
| 90 | private static $field_labels_right = [  | 
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| 91 | 'StyledImages' => 'Select as many as you like and sort them in the right order'  | 
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| 92 | ];  | 
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| 93 | |||
| 94 | private static $summary_fields = [  | 
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| 95 | 'Title' => 'Name',  | 
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| 96 | 'StyledImages.Count' => 'Number of Images'  | 
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| 97 | ];  | 
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| 98 | |||
| 99 | |||
| 100 | #######################  | 
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| 101 | ### Casting Section  | 
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| 102 | #######################  | 
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| 103 | |||
| 104 | |||
| 105 | #######################  | 
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| 106 | ### can Section  | 
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| 107 | #######################  | 
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| 108 | |||
| 109 | |||
| 110 | |||
| 111 | #######################  | 
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| 112 | ### write Section  | 
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| 113 | #######################  | 
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| 114 | |||
| 115 | |||
| 116 | |||
| 117 | |||
| 118 | View Code Duplication | public function validate()  | 
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| 163 | |||
| 164 | |||
| 165 | public function onBeforeWrite()  | 
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| 189 | |||
| 190 | public function requireDefaultRecords()  | 
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| 195 | |||
| 196 | |||
| 197 | #######################  | 
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| 198 | ### Import / Export Section  | 
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| 199 | #######################  | 
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| 200 | |||
| 201 | public function getExportFields()  | 
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| 206 | |||
| 207 | |||
| 208 | |||
| 209 | #######################  | 
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| 210 | ### CMS Edit Section  | 
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| 211 | #######################  | 
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| 212 | |||
| 213 | |||
| 214 | public function CMSEditLink()  | 
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| 220 | |||
| 221 | public function CMSAddLink()  | 
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| 227 | |||
| 228 | |||
| 229 | public function getCMSFields()  | 
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| 273 | |||
| 274 | |||
| 275 | /**  | 
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| 276 | * @return Int  | 
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| 277 | */  | 
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| 278 | public function ImageCount()  | 
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| 282 | |||
| 283 | /**  | 
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| 284 | * @return DataList  | 
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| 285 | */  | 
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| 286 | public function RawImages()  | 
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| 299 | |||
| 300 | /**  | 
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| 301 | * force the list to use a certain folder ...  | 
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| 302 | * @param string $folderName  | 
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| 303 | *  | 
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| 304 | * @return ImagesWithStyleSelection  | 
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| 305 | */  | 
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| 306 | public function createFolder($folderName)  | 
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| 314 | }  | 
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| 315 | 
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.