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1 | <?php |
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2 | /** |
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3 | * Box packing (3D bin packing, knapsack problem) |
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4 | * @package BoxPacker |
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5 | * @author Doug Wright |
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6 | */ |
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7 | namespace DVDoug\BoxPacker; |
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8 | |||
9 | /** |
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10 | * List of items to be packed, ordered by volume |
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11 | * @author Doug Wright |
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12 | * @package BoxPacker |
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13 | */ |
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14 | class ItemList extends \SplMaxHeap |
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15 | { |
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16 | |||
17 | /** |
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18 | * Compare elements in order to place them correctly in the heap while sifting up. |
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19 | * |
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20 | * @see \SplMaxHeap::compare() |
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21 | * |
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22 | * @param mixed $itemA |
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23 | * @param mixed $itemB |
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24 | * |
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25 | * @return int |
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26 | */ |
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27 | 34 | public function compare($itemA, $itemB) |
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28 | { |
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29 | 34 | if ($itemA->getVolume() > $itemB->getVolume()) { |
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30 | 14 | return 1; |
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31 | 34 | } elseif ($itemA->getVolume() < $itemB->getVolume()) { |
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32 | 14 | return -1; |
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33 | } else { |
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34 | 31 | return $itemA->getWeight() - $itemB->getWeight(); |
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35 | } |
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36 | } |
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37 | |||
38 | /** |
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39 | * Get copy of this list as a standard PHP array |
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40 | * @return array |
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41 | */ |
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42 | 25 | public function asArray() |
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43 | { |
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44 | 25 | $return = []; |
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45 | 25 | foreach (clone $this as $item) { |
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46 | 25 | $return[] = $item; |
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47 | } |
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48 | 25 | return $return; |
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49 | } |
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50 | } |
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51 |
This check compares the return type specified in the
@return
annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.