php curl CURLOPT_PASSWDFUNCTION选项

I can't use php's curl option CURLOPT_PASSWDFUNCTION, get notice:

PHP Notice:  Use of undefined constant CURLOPT_PASSWDFUNCTION - assumed 'CURLOPT_PASSWDFUNCTION'

Sample:

function get_passwd($ch, $string, $length){
    return 'password';
}
curl_setopt($ch, CURLOPT_PASSWDFUNCTION, 'get_passwd');

PHP info:

PHP 5.4.40 (cli) (built: Apr 29 2015 02:17:51) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

What i do wrong?

UPD: curl is working, when i execute my code i get message "please enter password", i enter password and get data over ssl using ecnryption and certificate. I want just avoid manual entering password.

Seems that this functionality has been removed:

CURLOPT_PASSWDFUNCTION
Introduced in 7.4.2
Deprecated since 7.11.1
Last used in 7.11.1

latest curl release is 7.42.1

Just by looking at the error I am assuming you haven't installed cURL libraries. If you have installed the cURL module make sure you have enabled it in your php.ini file. echo phpinfo(); can help you to find if you have installed the cURL module correctly. You can just do var_dump(CURLOPT_PASSWDFUNCTION); to find out what value it has, if php is able to find it.