Google\Cloud\BigQuery\ValueMapper::toParameter PHP Method

    public function toParameter($value)
    {
        $pValue = ['value' => $value];
        $type = gettype($value);
        switch ($type) {
            case 'boolean':
                $pType['type'] = self::TYPE_BOOL;
                break;
            case 'integer':
                $pType['type'] = self::TYPE_INT64;
                break;
            case 'double':
                $pType['type'] = self::TYPE_FLOAT64;
                break;
            case 'string':
                $pType['type'] = self::TYPE_STRING;
                break;
            case 'resource':
                $pType['type'] = self::TYPE_BYTES;
                $pValue['value'] = base64_encode(stream_get_contents($value));
                break;
            case 'object':
                list($pType, $pValue) = $this->objectToParameter($value);
                break;
            case 'array':
                list($pType, $pValue) = $this->isAssoc($value) ? $this->assocArrayToParameter($value) : $this->arrayToParameter($value);
                break;
            default:
                throw new \InvalidArgumentException(sprintf('Unrecognized value type %s. Please ensure you are using the latest version of google/cloud.', $type));
                break;
        }
        return ['parameterType' => $pType, 'parameterValue' => $pValue];
    }

 /**
  * Formats query parameters for the API.
  *
  * @param array $parameters The parameters to format.
  * @return array
  */
 private function formatQueryParameters(array $parameters)
 {
     $options = ['parameterMode' => $this->isAssoc($parameters) ? 'named' : 'positional', 'useLegacySql' => false];
     foreach ($parameters as $name => $value) {
         $param = $this->mapper->toParameter($value);
         if ($options['parameterMode'] === 'named') {
             $param += ['name' => $name];
         }
         $options['queryParameters'][] = $param;
     }
     return $options;
 }