CodeIgniter Error using Memcached inside cURL

Question

I'm getting an error when trying to use memcached inside a cURl write function inside Codeigniter.

curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($ch, $str)
                                        {                                                       //print(htmlentities($str)."\n\n");
$ci &= get_instance();
$ci->cache->memcached->save('foo', 'bar', 600);                                              return strlen($str);
});

The errors are

Message: Undefined variable: ci

Message: Object of class admin_test could not be converted to int

Any suggestions?

I tried the advice from this link CodeIgniter: can't access $this within function in view and from here: Object of class stdClass could not be converted to string

I can use the $ci syntax to make a database query like this

$ci->db->query('SELECT * FROM TABLE');

but not with memcached.

Answer 1

I figured it out, not nearly as hard as I thought.

I was using

$ci &= get_instance();

But what I needed was

$ci = get_instance();