Facebook API help
Where do I go from here? This is almost just copy paste from the example provided in the sdk. I don't understand how people can build anything with this API?? How do I open the prompt screen for login etc? Where the heck does Facebook say something about that?
<?php
require 'fb_sdk/src/facebook.php';
// Create our Application instance (replace thi开发者_运维技巧s with your appId and secret).
$facebook = new Facebook(array(
'appId' => 'APIID',
'secret' => 'SECRET',
));
// Get User ID
$user = $facebook->getUser();
// We may or may not have this data based on whether the user is logged in.
//
// If we have a $user id here, it means we know the user is logged into
// Facebook, but we don't know if the access token is valid. An access
// token is invalid if the user logged out of Facebook.
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}
// Permissions requested from the user.
$par = array();
$par['scope'] = 'user_about_me, read_friendlists';
// Login or logout url will be needed depending on current user state.
if ($user) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
$loginUrl = $facebook->getLoginUrl($par);
}
?>
You can find information on using the Graph for user authentication here on Facebook Developers.
With $loginUrl = $facebook->getLoginUrl($par); the variable $loginUrl will contain a url to the authentication dialog. Most developers either present this to the user as a link or perform a redirect with javascript - eg:
die('<script>top.location.href = "' . $loginUrl . '"</script>');
The other alternative is to use the JavaScript SDK with XFBML to authenticate (if you have cookies enable with both SDKs they will share session data) - example from here:
<?php
require 'php-sdk/src/facebook.php';
$facebook = new Facebook(array(
'appId' => 'YOUR_APP_ID',
'secret' => 'YOUR_APP_SECRET',
));
// See if there is a user from a cookie
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
echo '<pre>'.htmlspecialchars(print_r($e, true)).'</pre>';
$user = null;
}
}
?>
<!DOCTYPE html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
<body>
<?php if ($user_profile) { ?>
Your user profile is
<pre>
<?php print htmlspecialchars(print_r($user_profile, true)) ?>
</pre>
<?php } else { ?>
<fb:login-button></fb:login-button>
<?php } ?>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
appId: '<?php echo $facebook->getAppID() ?>',
cookie: true,
xfbml: true,
oauth: true
});
FB.Event.subscribe('auth.login', function(response) {
window.location.reload();
});
FB.Event.subscribe('auth.logout', function(response) {
window.location.reload();
});
};
(function() {
var e = document.createElement('script'); e.async = true;
e.src = document.location.protocol +
'//connect.facebook.net/en_US/all.js';
document.getElementById('fb-root').appendChild(e);
}());
</script>
</body>
</html>
You can also login purely with JavaScript using FB.Login:
FB.login(function(response) {
if (response.authResponse) {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Good to see you, ' + response.name + '.');
FB.logout(function(response) {
console.log('Logged out.');
});
});
} else {
console.log('User cancelled login or did not fully authorize.');
}
}, {scope: 'user_about_me, read_friendlists'});
It is mentioned in the comment :
// Login or logout url will be needed depending on current user state.
if ($user) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
$loginUrl = $facebook->getLoginUrl($par);
}
SDK will take care of that, you need not worry about it.
The user details are there in $user_profile
do a echo"<pre>"; print_r($user_profile); echo"</pre>"; and you will get it.
加载中,请稍侯......
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