使用PHP+Readline库实现类似于Shell解析命令功能

#!/usr/bin/php -q<?phpset_time_limit(0);@ob_end_flush();ob_implicit_flush(true);class prompt {  var $tty;  function prompt() {    if (substr(PHP_OS, 0, 3) == "WIN") {      $this->tty = fOpen("\con", "rb");    } else {      if (!($this->tty = fOpen("/dev/tty", "r"))) {        $this->tty = fOpen("php://stdin", "r");      }    }  }  function get($string, $length = 1024) {    echo $string;    $result = trim(fGets($this->tty, $length));    echo "\n";    return $result;  }}echo "Enter command or 'exit' to quit\n";do {  $cmdline = new prompt();  $buffer = $cmdline->get("PHP: ");  echo "accept cmd : $buffer\n";} while ($buffer !== "exit");echo "waiting for exit....\n";?>