fbjs.php

<script type="text/javascript">
    // Load the SDK asynchronously
    (function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/en_US/sdk.js";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

            // This is called with the results from from FB.getLoginStatus().
            function statusChangeCallback(response) {
                console.log('statusChangeCallback');
                console.log(response);
            // The response object is returned with a status field that lets the
            // app know the current login status of the person.
            // Full docs on the response object can be found in the documentation
            // for FB.getLoginStatus().
            if (response.status === 'connected') {
                console.log("connected");
                // Logged into your app and Facebook.
                if(empty($_SESSION['facebook'])) {
                    testAPI();
                }
            } else if (response.status === 'not_authorized') {
                console.log("not_authorized");
                // The person is logged into Facebook, but not your app.
                //document.getElementById('status').innerHTML = 'Please log ' +
                //    'into this app.';
                $.ajax({
                    url: 'fbfunctions.php',
                    type: 'post',
                    data: { fn: "logout"},
                    success: function(data) {
                        console.log(JSON.stringify(response));
                        //console.log(JSON.stringify(data));
                        if(data) {
                            window.location.href = "index.php";
                        }
                    }
                });
            } else {
                $.ajax({
                    url: 'fbfunctions.php',
                    type: 'post',
                    data: { fn: "logout"},
                    success: function(data) {
                        console.log(JSON.stringify(response));
                        //console.log(JSON.stringify(data));
                        if(data) {
                            window.location.href = "index.php";
                        }
                    }
                });
                // The person is not logged into Facebook, so we're not sure if
                // they are logged into this app or not.
                //document.getElementById('status').innerHTML = 'Please log ' +
                //    'into Facebook.';
            }
        }
        // This function is called when someone finishes with the Login
        // Button.  See the onlogin handler attached to it in the sample
        // code below.
        function checkLoginState() {
            FB.getLoginStatus(function(response) {
                statusChangeCallback(response);
            });
        }
        function fb_login() {
            FB.login(function(response) {
                checkLoginState();
            });
        }
        window.fbAsyncInit = function() {
            FB.init({
                appId      : '258249911282302',
                cookie     : true,  // enable cookies to allow the server to access 
                                // the session
                xfbml      : true,  // parse social plugins on this page
                version    : 'v2.8' // use graph api version 2.8
            });
            // Now that we've initialized the JavaScript SDK, we call 
            // FB.getLoginStatus().  This function gets the state of the
            // person visiting this page and can return one of three states to
            // the callback you provide.  They can be:
            //
            // 1. Logged into your app ('connected')
            // 2. Logged into Facebook, but not your app ('not_authorized')
            // 3. Not logged into Facebook and can't tell if they are logged into
            //    your app or not.
            //
            // These three cases are handled in the callback function.
            FB.getLoginStatus(function(response) {
                statusChangeCallback(response);
            });
        };
    
        // Here we run a very simple test of the Graph API after login is
        // successful.  See statusChangeCallback() for when this call is made.
        function testAPI() {
            console.log('Welcome!  Fetching your information.... ');
            FB.api('/me?fields=id,name,first_name,last_name,email,picture,gender,age_range,id', function(response) {
                $.ajax({
                    url: 'fbfunctions.php',
                    type: 'post',
                    data: { fn: "login", info: response},
                    success: function(data) {
                        console.log(JSON.stringify(response));
                        //console.log(JSON.stringify(data));
                        if(data) {
                            window.location.href = "index.php";
                        }
                    }
                });
                //console.log('Successful login for: ' + response.name);
                //document.getElementById('status').innerHTML =
                //  'Thanks for logging in, ' + response.name + '!';
            });
        }
    </script>