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<?php class DataMapper { /** * @var array */ private $rawData; /** * @var array */ private $parsedData; /** * @var array */ private $mapping = [ 'dbField1' => 'outputField1', 'dbField2' => ['outputField3' => ['double']] 'dbField3' => ['outputField3' => ['double', 'dollars']] ]; public function __construct(array $data) { $this->rawData = $data; $this->mapData(); } /** * @param $value * @return mixed */ private function double($value) { return $value * 2; } /** * @param $value * @return string */ private function dollars($value) { return $value . "$"; } // Yes, I know the methods shouldn't be here but it rather be decoupled in another class and // injected with a DI it but I wrote it like this with example purposes only private function mapData() { foreach($this->mapping as $dbFieldName => $content) { if(isset($this->rawData[$dbFieldName])) { if(is_string($content)) { $this->parsedData[$content] = $this->rawData[$dbFieldName]; } else if (is_array($content)) { $frontFieldName = key($content); $functionsArray = reset($content); $value = $this->rawData[$dbFieldName]; foreach($functionsArray as $functionName) { $value = $this->{$functionName}($value); } $this->parsedData[$frontFieldName] = $value; } } } } /** * Simple getter * @return array */ public function getParsedData() { return $this->parsedData; } } // Usually the data comes from the DB so it would be in some kind of Row Set structure $data = ['dbField1' => 1, 'dbField2' => 10, 'dbField3' => 100]; // The data is handed to the Holder which parses it $dm = new DataMapper($data); // The data is parsed so it can be echo json_encode($dm->getParsedData());