Will, let’s do it like this.
Try this code:
< ?php
// login, it's ok
doConnectToGooglePlus2('my-login', 'my-pass'); // image url
$lnk = array('img'=> 'https://upload.wikimedia.org/wikipedia/commons/6/63/Wikipedia-logo.png');
// post - return error above
doPostToGooglePlus2('message', $lnk, 'google-plus-page-id');
?>
I am pretty sure this will work. Now you need to investigate what is not correct with your image.
