I'm generating a Login URL, which works great, but in my case the email permission is mandatory so I need to explain to the user and re-ask the email permission.
Here's how I'm generating the URL:
$fb = new Facebook\Facebook([
'app_id' => fbappid,
'app_secret' => fbappsecret,
'default_graph_version' => 'v2.2',
]);
$helper = $fb->getRedirectLoginHelper();
$permissions = ['email', 'user_birthday', 'user_location', 'user_hometown', 'user_relationships']; // Optional permissions
$loginUrl = $helper->getLoginUrl('http://localhost/urbanportal/wifilogin.php?origlink='.$_SESSION['origlink'].'&routerlink='.$_SESSION['routerlink'].'&siteid='.$_SESSION['siteid'], $permissions);
I read that you can pass a third parameter that says you're doing a re-request like so:
$loginUrl = $helper->getLoginUrl('http://localhost/urbanportal/wifilogin.php?origlink='.$_SESSION['origlink'].'&routerlink='.$_SESSION['routerlink'].'&siteid='.$_SESSION['siteid'], $permissions, true);
But I'm getting a "Length of param app_id must be less than or equal to 32" Facebook error, maybe that was for SDK 4.0?
The documentation always seems to navigate me to:
FB.login(
function(response) {
console.log(response);
},
{
scope: 'user_likes',
auth_type: 'rerequest'
}
);
But this is for Javascript SDK...
A quick look in the source code of the SDK reveals that there’s a dedicated method getReRequestUrl for that:
/**
* Returns the URL to send the user in order to login to Facebook with permission(s) to be re-asked.
*
* @param string $redirectUrl The URL Facebook should redirect users to after login.
* @param array $scope List of permissions to request during login.
* @param string $separator The separator to use in http_build_query().
*
* @return string
*/
public function getReRequestUrl($redirectUrl, array $scope = [], $separator = '&')
I hope you are aware though that you will not get an email address for every FB user; f.i. they simply might not have one on file with Facebook, so even with the email permission you won’t get an email address.