Dotenv\Loader::normaliseEnvironmentVariable PHP Method

    protected function normaliseEnvironmentVariable($name, $value)
    {
        list($name, $value) = $this->splitCompoundStringIntoParts($name, $value);
        list($name, $value) = $this->sanitiseVariableName($name, $value);
        list($name, $value) = $this->sanitiseVariableValue($name, $value);
        $value = $this->resolveNestedVariables($value);
        return array($name, $value);
    }