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<?php const LOCATION_PRECISION = 7; const LOCATION_LAT = '40.7591523'; const LOCATION_LNG = '-73.9777136'; trait Geocodes { protected $recast = []; protected $precision = LOCATION_PRECISION; abstract function reCast(array &$payload); } class Location //implements ArrayAccess { use Geocodes; //FATAL: can't override here! //protected $recast = [ // 'lat' => ['index' => 'lat', 'type' => 'double'], // 'lng' => ['index' => 'lng', 'type' => 'double'] //]; protected $lat = LOCATION_LAT; protected $lng = LOCATION_LNG; public function __construct() { $this->precision = LOCATION_PRECISION; $this->recast['lat'] = ['index' => 'lat', 'type' => 'double']; $this->recast['lng'] = ['index' => 'lng', 'type' => 'double']; } public function recast(array &$payload) { foreach(array_keys($payload) as $key) { var_dump($payload); $api_key = $this->recast[$key]['index']; $api_type = $this->recast[$key]['type']; if(! array_key_exists($api_key, $payload)) $payload[$api_key] = bcadd($payload[$key],0,$this->precision); } } public function getLat() { return $this->lat; } public function getLng() { return $this->lng; } } $loc = new Location(); $payload = ['lat' => $loc->getLat(), 'lng' => $loc->getLng()]; $loc->recast($payload); echo PHP_EOL.print_r($payload, 1).PHP_EOL;