App\Libraries\Utils::getDatePart PHP Method

    private static function getDatePart($part, $offset)
    {
        $offset = intval($offset);
        if ($part == 'MONTH') {
            return Utils::getMonth($offset);
        } elseif ($part == 'QUARTER') {
            return Utils::getQuarter($offset);
        } elseif ($part == 'YEAR') {
            return Utils::getYear($offset);
        }
    }

 public static function processVariables($str)
 {
     if (!$str) {
         return '';
     }
     $variables = ['MONTH', 'QUARTER', 'YEAR'];
     for ($i = 0; $i < count($variables); $i++) {
         $variable = $variables[$i];
         $regExp = '/:' . $variable . '[+-]?[\\d]*/';
         preg_match_all($regExp, $str, $matches);
         $matches = $matches[0];
         if (count($matches) == 0) {
             continue;
         }
         usort($matches, function ($a, $b) {
             return strlen($b) - strlen($a);
         });
         foreach ($matches as $match) {
             $offset = 0;
             $addArray = explode('+', $match);
             $minArray = explode('-', $match);
             if (count($addArray) > 1) {
                 $offset = intval($addArray[1]);
             } elseif (count($minArray) > 1) {
                 $offset = intval($minArray[1]) * -1;
             }
             $val = Utils::getDatePart($variable, $offset);
             $str = str_replace($match, $val, $str);
         }
     }
     return $str;
 }