访问令牌 - 我如何获得它们？

Question

I have a simple question: How can I get a users access token??

I only need the basic information, so when a user clicks on "allow" on my page, I want to be able to get That users picture/username etc.

To do this i need to fetch the access token of that user.

Answer 1

If you're using PHP the access Token is available to your application after a successfull user login. That means that you should write the code to do that. Personally I have a simple PHP page (fblogin.php) that I open in a new window, here's the code (it uses facebook sdk, be sure to download it, also remember to create an application in facebook in case you dont have one)

require_once ('facebook/src/facebook.php');

// handel cancel
if (isset($_REQUEST['error_reason'])) {
     echo("<script>self.close();</script>");
     exit;
}

// ger request params
$code = $_REQUEST["code"];
$my_url = 'http://www.yourdomain.com/fblogin.php';
$api_key = 'YOURAPIKEY';
$secret = 'YOURSECRETCODE';

// build login url
$loginUrl = $facebook->getLoginUrl(array(
    'req_perms' => 'email,user_birthday',
    'display' => 'popup',
    'redirect_uri' => 'http://www.yourdomain.com/fblogin.php'
    ));

// if no facebook code is given, write login back againg to the window
if(empty($code)) {

    echo("<script> top.location.href='" . $loginUrl . "'</script>");
    exit;

} else {

        //set token for facebook object from graph
        $token_url = "https://graph.facebook.com/oauth/access_token?"
           . "client_id=" . $api_key . "&redirect_uri=" . urlencode($my_url)
           . "&client_secret=" . $secret . "&code=" . $code;

        $response = @file_get_contents($token_url);
        $params = null;
        parse_str($response, $params);

        $facebook->setAccessToken($params['access_token']);
        $fbme = $facebook->api('/me', 'GET');



        if ($fbme) {
            // YOU got the user, id, token, etc. 
                        // do anything you want here,
        } 

}