code: private function parseQuote(&$argv, $argument, $quoteType)
      {
          if (substr($argument, strlen($argument) - 1, 1) !== $quoteType) {
              $this->argv[] = substr($argument, 1);
              while (
                  ($argument_part = array_shift($argv)) != null
                  && substr(
                      $argument_part,
                      strlen($argument_part) - 1,
                      1
                  ) !== $quoteType
              ) {
                  $this->argv[count($this->argv) - 1] .= ' '.$argument_part;
              }
              $this->argv[count($this->argv) - 1] .=
              ' '.substr($argument_part, 0, strlen($argument_part) - 1);
          } else {
              $this->argv[] = substr(
                  substr(
                      $argument,
                      1
                  ),
                  0,
                  strlen($argument) - 2
              );
          }
      }
docs: Parse all parameters between two matching single or double quotes
  to a single element in the parameter array.
  
  @param  array  &$argv
  @param  string $argument
  @param  string $quoteType