php - Get facebook user email -

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i have facebook app , i'm trying user's email, 

uncaught oauthexception: unknown path components: /email

on using following code:

$email= idx($facebook->api('me/email'),'data',array()); function idx(array $array, $key, $default = null) {   return array_key_exists($key, $array) ? $array[$key] : $default; }

what doing wrong?

that's way use normally:

$user_profile = $fb->api('/me'); $email=$user_profile['email'];

so can it:

$email=idx($facebook->api('/me'),'email',array());

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