code: public function getMaxFileSize(): int
      {
          $iniMax = strtolower(ini_get('upload_max_filesize'));
  
          if ('' === $iniMax) {
              return PHP_INT_MAX;
          }
  
          $max = ltrim($iniMax, '+');
          if (0 === strpos($max, '0x')) {
              $max = intval($max, 16);
          } elseif (0 === strpos($max, '0')) {
              $max = intval($max, 8);
          } else {
              $max = (int) $max;
          }
  
          switch (substr($iniMax, -1)) {
              case 't':
                  $max *= 1024;
              // no break
              case 'g':
                  $max *= 1024;
              // no break
              case 'm':
                  $max *= 1024;
              // no break
              case 'k':
                  $max *= 1024;
              // no break
          }
  
          return $max;
      }
docs: Returns the maximum size of an uploaded file as configured in php.ini.
  
  @return int The maximum size of an uploaded file in bytes