Twilio api 解析错误:意外T_CONST，预期T_OLD_FUNCTION或T_FUNCTION或T_VAR或

我有PHP 5.4.21

我正在使用在浏览器中正常工作的 Twilio API，但在命令行模式下，我收到以下错误：

<b>Parse error</b>:  syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>sms/Services/Twilio.php</b> on line <b>36</b>

是以下类的一部分，请参阅我指定第 36 行的注释。

我根据一些初始反馈请求添加了第 36 行之前和之后的所有代码行作为上下文，以显示这些行。

<?php
function Services_Twilio_autoload($className) {
    if (substr($className, 0, 15) != 'Services_Twilio') {
        return false;
    }
    $file = str_replace('_', '/', $className);
    $file = str_replace('Services/', '', $file);
    return include dirname(__FILE__) . "/$file.php";
}
spl_autoload_register('Services_Twilio_autoload');
/**
 * Create a client to talk to the Twilio API.
 *
 *
 * :param string               $sid:      Your Account SID
 * :param string               $token:    Your Auth token from
 *      twilio.com/user/account
 * :param string               $version:  API version to use
 * :param $_http:    A HTTP client for making requests.
 * :type $_http: :php:class:`Services_Twilio_Http`
 * :param int                  $retryAttempts:
 *      Number of times to retry failed requests. Currently only idempotent
 *      requests (GET's and DELETE's) are retried .
 */
class Services_Twilio extends Services_Twilio_Resource
{
    /* this is Line 36... */
    const USER_AGENT = 'twilio-php/3.12.0';
    protected $http;
    protected $retryAttempts;
    protected $last_response;
    protected $version;
    protected $versions = array('2008-08-01', '2010-04-01');
    public function __construct(
        $sid,
        $token,
        $version = null,
        Services_Twilio_TinyHttp $_http = null,
        $retryAttempts = 1
    ) {
              $_http = new Services_Twilio_TinyHttp(
                  "https://api.twilio.com",
                  array("curlopts" => array(
                      CURLOPT_USERAGENT => self::USER_AGENT,
                      CURLOPT_HTTPHEADER => array('Accept-Charset: utf-8'),
                      CURLOPT_CAINFO => dirname(__FILE__) . '/cacert.pem',
                  ))
              );
    }
}
?>