how to add attachment via API

How to track opens via php SDK API? "open_tracking" don't seems to work.

PHP:
           // optional block, defaults are shown
            'options' => array(
                'url_tracking'      => 'yes', // yes | no
                'open_tracking'      => 'yes', // yes | no
                'json_feed'         => 'yes', // yes | no
                'xml_feed'          => 'yes', // yes | no
                'plain_text_email'  => 'yes',// yes | no
                'email_stats'       => null, // a valid email address where we should send the stats after campaign done
 
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