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<?php interface Mappable { public function getMetaData(); public function setMetaData(array $metaData); } class BaseMap implements Mappable { protected $metaData = []; public function getMetaData() { return $this->metaData; } public function setMetaData(array $metaData) { $this->metaData = $metaData; } /** * Possible Code Smell */ public static function getMapper() { return new Mapper(new static); } } class MapA extends BaseMap { protected $metaData = [ 'backField1' => 'frontField1', 'backField2' => 'frontField2' ]; } class MapB extends BaseMap { protected $metaData = [ 'backFieldA' => 'frontFieldA', 'backFieldB' => 'frontFieldB' ]; } class Mapper { private $map; public function __construct(Mappable $map) { $this->setMap($map); } public function setMap(Mappable $map) { $this->map = $map; } public function parseData($dataRow) { $metaData = $this->map->getMetaData(); $parsedDataRow = []; foreach($dataRow as $columnName => $columnValue) { if(isset($metaData[$columnName])) $parsedDataRow[$metaData[$columnName]] = $columnValue; } return $parsedDataRow; } } // Probably correct $mapper = new Mapper(new MapA()); print_r($mapper->parseData(['backField1' => 'foo1', 'backField2' => 'bar1'])); $mapper->setMap(new MapB()); print_r($mapper->parseData(['backFieldA' => 'fooA', 'backFieldB' => 'barB'])); // Probably smelly print_r(MapA::getMapper()->parseData(['backField1' => 'foo1', 'backField2' => 'bar1'])); print_r(MapB::getMapper()->parseData(['backFieldA' => 'fooA', 'backFieldB' => 'barB']));