src/FelixOnline/Base/BaseModel.php
protected function from_camel_case($str)
    {
        $str[0] = strtolower($str[0]);
        $func = create_function('$c', 'return "_" . strtolower($c[1]);');
        return preg_replace_callback('/([A-Z])/', $func, $str);
    }
protected function from_camel_case($str)
    {
        $str[0] = strtolower($str[0]);
        $func = create_function('$c', 'return "_" . strtolower($c[1]);');
        return preg_replace_callback('/([A-Z])/', $func, $str);
    }
/*
Convert camel case to underscore
http://www.paulferrett.com/2009/php-camel-case-functions/