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:
Complex classes like PageRating often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use PageRating, and based on these observations, apply Extract Interface, too.
1 | <?php |
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8 | class PageRating extends DataObject |
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9 | { |
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10 | |||
11 | /** |
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12 | * @var bool |
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13 | */ |
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14 | private static $admin_can_create = true; |
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15 | |||
16 | /** |
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17 | * @var bool |
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18 | */ |
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19 | private static $admin_can_edit = true; |
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20 | |||
21 | /** |
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22 | * @var bool |
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23 | */ |
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24 | private static $admin_can_delete = true; |
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25 | |||
26 | /** |
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27 | * @var boolean |
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28 | */ |
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29 | private static $round_rating = true; |
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30 | |||
31 | /** |
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32 | * @var array |
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33 | */ |
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34 | private static $stars = array( |
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35 | '1' => array("Code" => 'OneStar', "Title" => "One Star"), |
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36 | '2' => array("Code" => 'TwoStar', "Title" => "Two Stars"), |
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37 | '3' => array("Code" => 'ThreeStar', "Title" => "Three Stars"), |
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38 | '4' => array("Code" => 'FourStar', "Title" => "Four Stars"), |
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39 | '5' => array("Code" => 'FiveStar', "Title" => "Five Stars") |
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40 | ); |
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41 | |||
42 | /** |
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43 | * |
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44 | * @return array |
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45 | */ |
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46 | protected static function get_stars() |
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50 | |||
51 | /** |
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52 | * returns something like OneStar |
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53 | * @param int $value |
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54 | * |
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55 | * @return string |
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56 | */ |
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57 | View Code Duplication | public static function get_star_entry_code($value) |
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65 | |||
66 | /** |
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67 | * returns something like One Star |
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68 | * @param int $value |
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69 | * |
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70 | * @return string |
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71 | */ |
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72 | View Code Duplication | public static function get_star_entry_name($value) |
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80 | |||
81 | /** |
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82 | * returns something like |
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83 | * |
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84 | * 1 => One Star, |
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85 | * 2 => Two Star |
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86 | * |
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87 | * @return array |
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88 | */ |
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89 | public static function get_star_dropdowndown() |
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100 | |||
101 | /** |
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102 | * return int |
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103 | */ |
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104 | public static function get_number_of_stars() |
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108 | |||
109 | private static $_star_details_as_array_data = array(); |
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110 | |||
111 | /** |
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112 | * |
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113 | * |
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114 | * @return ArrayData |
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115 | */ |
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116 | public static function get_star_details_as_array_data($score, $parentID, $method = "unkown") |
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148 | |||
149 | private static $db = array( |
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150 | "Rating" => "Int", |
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151 | "Name" => "Varchar(100)", |
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152 | "Title" => "Varchar(100)", |
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153 | "Comment" => "Text", |
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154 | "IsApproved" => "Boolean", |
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155 | "IsDefault" => "Boolean" |
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156 | ); |
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157 | |||
158 | private static $has_one = array( |
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159 | "Parent" => "Page" |
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160 | ); |
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161 | |||
162 | private static $summary_fields = array( |
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163 | "Created" => "When", |
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164 | "Rating" => "Score", |
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165 | "Parent.Title" => "Page", |
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166 | "Comment" => "Comment", |
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167 | "IsApproved.Nice" => "Approved" |
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168 | ); |
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169 | |||
170 | private static $field_labels = array( |
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171 | "Rating" => "Score", |
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172 | "Parent.Title" => "Page", |
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173 | "IsDefault" => "Default Entry Only", |
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174 | "Parent" => "Rating for", |
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175 | "IsApproved" => "Approved" |
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176 | ); |
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177 | |||
178 | private static $casting = array( |
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179 | 'Method' => "Varchar", |
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180 | 'Stars' => "Float", |
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181 | 'Percentage' => "Float", |
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182 | 'RoundedPercentage' => "Int", |
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183 | 'ReversePercentage' => "Float", |
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184 | 'ReverseRoundedPercentage' => "Int", |
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185 | 'StarClass' => "Varchar" |
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186 | ); |
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187 | |||
188 | private static $default_sort = "Created DESC"; |
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189 | |||
190 | private static $singular_name = 'Page Rating'; |
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191 | |||
192 | private static $plural_name = 'Page Ratings'; |
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193 | |||
194 | |||
195 | public function getCMSFields() |
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264 | |||
265 | /** |
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266 | * updates Page Rating for a Page and saves it with the Page. |
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267 | * Updates SiteTree.PageRating field ... |
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268 | * |
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269 | * if $siteTreeID is 0 then ALL pages are updated ... |
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270 | * |
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271 | * @param integer $siteTreeID |
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272 | */ |
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273 | public static function update_ratings($siteTreeID = 0) |
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301 | |||
302 | public function onBeforeWrite() |
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309 | |||
310 | public function requireDefaultRecords() |
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319 | |||
320 | public function canCreate($member = null) |
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327 | |||
328 | public function canDelete($member = null) |
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335 | |||
336 | public function canEdit($member = null) |
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343 | |||
344 | /** |
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345 | * @alias |
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346 | * |
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347 | * @return string |
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348 | */ |
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349 | public function Method() |
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353 | |||
354 | /** |
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355 | * casted variable |
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356 | * |
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357 | * @return string |
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358 | */ |
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359 | public function getMethod() |
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364 | |||
365 | /** |
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366 | * @alias |
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367 | * |
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368 | * @return int | float |
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369 | */ |
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370 | public function Stars() |
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374 | |||
375 | /** |
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376 | * casted variable |
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377 | * |
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378 | * @return int | float |
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379 | */ |
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380 | public function getStars() |
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385 | |||
386 | /** |
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387 | * @alias |
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388 | * |
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389 | * @return string |
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390 | */ |
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391 | public function Percentage() |
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395 | |||
396 | /** |
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397 | * casted variable |
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398 | * |
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399 | * @return float |
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400 | */ |
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401 | public function getPercentage() |
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406 | |||
407 | /** |
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408 | * @alias |
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409 | * |
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410 | * @return int |
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411 | */ |
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412 | public function RoundedPercentage() |
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416 | |||
417 | /** |
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418 | * casted variable |
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419 | * |
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420 | * @return int |
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421 | */ |
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422 | public function getRoundedPercentage() |
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427 | |||
428 | /** |
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429 | * casted alias |
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430 | * |
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431 | * @return string |
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432 | */ |
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433 | public function ReversePercentage() |
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437 | |||
438 | /** |
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439 | * casted variable |
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440 | * |
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441 | * @return float |
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442 | */ |
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443 | public function getReversePercentage() |
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448 | |||
449 | /** |
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450 | * @alias |
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451 | * |
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452 | * @return int |
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453 | */ |
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454 | public function ReverseRoundedPercentage() |
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458 | |||
459 | /** |
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460 | * casted variable |
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461 | * |
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462 | * @return int |
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463 | */ |
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464 | public function getReverseRoundedPercentage() |
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469 | |||
470 | /** |
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471 | * @alias |
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472 | * |
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473 | * @return string |
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474 | */ |
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475 | public function StarClass() |
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479 | |||
480 | /** |
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481 | * casted variable |
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482 | * |
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483 | * @return string |
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484 | */ |
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485 | public function getStarClass() |
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490 | } |
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491 |
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.