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<?php |
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namespace PFlorek\Elevator; |
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class Elevator |
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{ |
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/** |
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* Elevates an one-dimensional or any \Traversable to a multi-dimensional array. |
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* Splits the keys by the delimiter into tokens. The tokens will become |
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* the key of each node of the multi-dimensional array. |
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* |
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* @param array|\Traversable $flattened The map to be elevated to a tree. |
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* @param string $delimiter The delimiter to split the map's keys. |
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* @return array |
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*/ |
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public function up($flattened, $delimiter = '.') |
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{ |
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if (!is_iterable($flattened)) { |
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throw new \RuntimeException('Argument must be of type iterable (array or \Traversable).'); |
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} |
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$result = []; |
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foreach ($flattened as $path => $value) { |
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$current = &$result; |
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foreach (explode($delimiter, $path) as $key) { |
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$current[$key] = !array_key_exists($key, $current) ? [] : (array)$current[$key]; |
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$current = &$current[$key]; |
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} |
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$current = $value; |
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} |
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return $result; |
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} |
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/** |
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* Flattens a multi-dimensional array or any \\Traversable into an one-dimensional array. |
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* |
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* @param array|\Traversable $elevated The tree to be fold down to a map. |
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* @param string $delimiter The delimiter used to materialize the path. |
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* @return array |
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*/ |
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public function down($elevated, $delimiter = '.') |
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{ |
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if (!is_iterable($elevated)) { |
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throw new \RuntimeException('Argument must be of type iterable (array or \Traversable).'); |
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} |
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$result = []; |
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$this->walk($result, $elevated, $delimiter); |
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return $result; |
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} |
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/** |
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* Internal pre-order tree walker appends each leaf with its materialized path to the resulting map. |
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* |
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* @param array $result |
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* @param array $elevated |
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* @param string $delimiter |
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* @param string $path |
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*/ |
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private function walk(&$result, &$elevated, $delimiter, $path = null) |
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{ |
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foreach ($elevated as $key => $value) { |
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$current = null !== $path ? $path . $delimiter . $key : $key; |
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if (!is_array($value) || !count($value)) { |
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$result[$current] = $value; |
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} else { |
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$this->walk($result, $value, $delimiter, $current); |
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} |
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} |
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} |
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} |
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pflorek /
php-elevator
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