original_string: public function getMissingParameterKey(array $parameters, array $requiredKeys = [])
      {
          foreach ($requiredKeys as $key) {
              if (! isset($parameters[$key])) {
                  return $key;
              }
          }
      }
code: public function getMissingParameterKey(array $parameters, array $requiredKeys = [])
      {
          foreach ($requiredKeys as $key) {
              if (! isset($parameters[$key])) {
                  return $key;
              }
          }
      }
code_tokens: public function getMissingParameterKey ( array $ parameters , array $ requiredKeys = [ ] ) { foreach ( $ requiredKeys as $ key ) { if ( ! isset ( $ parameters [ $ key ] ) ) { return $ key ; } } }
docstring: Get missing parameter's key.
  
  @param array $parameters
  @param array $requiredKeys
  
  @return string|null
docstring_tokens: Get missing parameter s key .