1 | <?php |
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5 | trait PaginatedList |
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6 | { |
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7 | /* @var integer */ |
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8 | protected $position = 0; |
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9 | |||
10 | /** |
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11 | * Rewind the Iterator to the first element. |
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12 | * |
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13 | * @link http://php.net/manual/en/iterator.rewind.php |
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14 | * |
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15 | * @return void |
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16 | */ |
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17 | public function rewind() |
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18 | { |
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19 | $this->position = 0; |
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20 | } |
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21 | |||
22 | /** |
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23 | * Checks if current position is valid. |
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24 | * |
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25 | * @link http://php.net/manual/en/iterator.valid.php |
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26 | * |
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27 | * @return bool |
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28 | */ |
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29 | public function valid() |
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30 | { |
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31 | if (!isset($this->resources[$this->position])) { |
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32 | $this->fetchBatch(); |
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33 | } |
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34 | |||
35 | return isset($this->resources[$this->position]); |
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36 | } |
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37 | |||
38 | /** |
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39 | * Return the current element. |
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40 | * |
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41 | * @link http://php.net/manual/en/iterator.current.php |
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42 | * |
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43 | * @return mixed |
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44 | */ |
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45 | public function current() |
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46 | { |
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47 | return $this->resources[$this->position]; |
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48 | } |
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49 | |||
50 | /** |
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51 | * Move forward to next element. |
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52 | * |
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53 | * @link http://php.net/manual/en/iterator.next.php |
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54 | * |
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55 | * @return void |
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56 | */ |
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57 | public function next() |
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58 | { |
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59 | $this->position++; |
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60 | } |
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61 | |||
62 | /** |
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63 | * Return the key of the current element. |
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64 | * |
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65 | * @link http://php.net/manual/en/iterator.key.php |
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66 | * |
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67 | * @return int|null Scalar on success, or null on failure. |
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68 | */ |
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69 | public function key() |
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73 | } |
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74 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: