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<?php |
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namespace Gielfeldt\Iterators; |
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/** |
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* Provide fielded rows of an array from a csv file. |
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* |
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* Input: |
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* [ |
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* ['column1 header', 'column2 header', 'column3 header'], |
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* ['value 1', 'value 2', 'value 3'], |
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* ['value 4', 'value 5', 'value 6'], |
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* ] |
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* |
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* Output: |
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* [ |
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* ['column1 header' => 'value 1', 'column2 header' => 'value 2', 'column3 header' => 'value 3'], |
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* ['column1 header' => 'value 4', 'column2 header' => 'value 5', 'column3 header' => 'value 6'], |
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* ] |
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*/ |
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class CsvFileObject extends \SplFileObject implements \JsonSerializable, \Countable |
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{ |
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/** |
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* The fields of a row. |
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* |
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* @var array |
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*/ |
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protected $fields; |
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public $rows; |
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/** |
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* SplFileObject constructor. |
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* |
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* Setup SplFileObject in CSV read-mode. |
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*/ |
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public function __construct($filename, $open_mode = "r", $use_include_path = false, $context = null) |
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{ |
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parent::__construct($filename, $open_mode, $use_include_path, $context); |
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$this->setFlags(\SplFileObject::READ_CSV | \SplFileObject::READ_AHEAD | \SplFileObject::SKIP_EMPTY | \SplFileObject::DROP_NEW_LINE); |
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$this->processHeader(); |
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} |
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/** |
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* Get determined fields for this csv file. |
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*/ |
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public function getFields() |
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{ |
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return $this->fields; |
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} |
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/** |
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* Fetch fields from the current row. |
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* |
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* This method should only be called when file is rewound. |
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*/ |
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protected function processHeader() |
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{ |
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$this->fields = array_values(parent::current()); |
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parent::next(); |
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} |
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/** |
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* Rewind file and fetch fields from first row. |
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*/ |
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public function rewind() |
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{ |
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parent::rewind(); |
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$this->processHeader(); |
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} |
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/** |
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* Map row into fields. |
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*/ |
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public function current() |
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{ |
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$row = parent::current(); |
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$fieldedRow = []; |
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foreach ($this->fields as $idx => $field) { |
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$fieldedRow[$field] = $row[$idx] ?? null; |
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} |
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return $fieldedRow; |
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} |
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public function valid() |
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{ |
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$valid = parent::valid(); |
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if (!$valid && !isset($this->rows) && !is_null($this->key())) { |
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$this->rows = $this->key(); |
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} |
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return $valid; |
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} |
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/** |
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* Subtract 1 row from index, so that we don't include the header in our count. |
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*/ |
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public function key() |
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{ |
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return parent::key() - 1; |
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} |
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/** |
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* Add 1 to skip the header when seeking. |
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*/ |
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public function seek($position) |
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{ |
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4 |
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if ($position < 0) { |
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throw new \LogicException("Can't seek file " . $this->getFilename() . " to negative line $position"); |
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} |
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return parent::seek($position + 1); |
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} |
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/** |
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* Implements jsonSerialize. |
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*/ |
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3 |
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public function jsonSerialize() |
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{ |
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return iterator_to_array($this); |
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} |
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/** |
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* Implements Countable. |
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*/ |
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3 |
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public function count() |
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{ |
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3 |
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if (!isset($this->rows)) { |
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3 |
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$this->seek($this->getSize()); |
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3 |
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$this->rows = $this->key(); |
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} |
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3 |
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return $this->rows; |
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} |
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} |
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This check looks for a call to a parent method whose name is different than the method from which it is called.
Consider the following code:
The
getFirstName()method in theSoncalls the wrong method in the parent class.