How to Post in Facebook Group in PHP

The feed of posts (including status updates) and links published to this group.

Step 1: Download Facebook Sdk on: Facebook php SDK and Copy src folder.

Step 2: Create config.php file in src folder path src/config.php.

Config.php
<?php
    $config['Redirect_url']     =   'http://www.yoursitename.com/?fbTrue=true';  // Your Domain  /?fbTrue=true is required.
    $config['APP_ID']           =   '****************'; // Your Facebook App ID
    $config['APP_SECRET_KEY']   =   '****************'; // Your Facebook App Secret Key
?>

After this fill redirect url, facebook app id and facebook app secret key.

Step 3: After complete step 2 then create index.php in root folder.

Index.php

<?php
    session_start();
    include('src/config.php');
    include('src/facebook.php');

    $facebook = new Facebook(array(
                  'appId'  => $config['APP_ID'],
                  'secret' => $config['APP_SECRET_KEY'],
                  'cookie' => true
                ));
    if(isset($_POST['status'])) {
        $groupId = $_POST['group'];
        $publishPost = $facebook->api('/'.$groupId.'/feed', 'post',
                                array('access_token' => $_SESSION['token'],
                                'message'=> 'Testing',
                                'from' => $config['App_ID'],
                                'to' => $groupId,
                                'caption' => 'PHP Gang',
                                'name' => 'PHP Gang',
                                'link' => 'http://www.yoursitename.com/',// Your site Url
                                'picture' => 'http://www.yoursitename.com/img/logo.png', // Your Image Link
                                'description' => 'What is Loren ipsum ' // Your Description
                            ));
        $publishPost = $facebook->api('/'.$groupId.'/feed', 'post',
                                        array('access_token' => $_SESSION['token'],
                                                'message'=>$_POST['status'] .'   via PHPGang.com Demo',
                                                'from' => $config['App_ID']
                                    ));
        $message = 'Status updated.<br>';
        $graphUrlGroups = "https://graph.facebook.com/v2.1/me/groups?access_token=".$_SESSION['token'];
        $allGroups = json_decode(file_get_contents_curl($graphUrlGroups));
        $dropdownGroupList = "";
        for($i=0;$i<count($allGroups->data);$i++){
            $dropdownGroupList .= "<option value='".$allGroups->data[$i]->access_token."-".$allGroups->data[$i]->id."'>".$allGroups->data[$i]->name."</option>";
        }
        $contentStyle = '<style>
                            #status {
                                width: 300px;
                                height: 25px;
                                font-size: 16px;
                            }
                        </style>'.$message.'
                        <form action="index.php" method="post">
                            Select Group you want to post status: <br>
                            <select name="group" id="status">'.$dropdownGroupList.'</select><br><br>
                            <input type="text" name="status" id="status" placeholder="" />
                            <input type="submit" value="Post On My Group!" style="padding: 5px;" />
                        <form>';
    }
    else if(isset($_GET['fbTrue'])) {
        $tokenUrl = "https://graph.facebook.com/v2.1/oauth/access_token?"
                    . "client_id=".$config['APP_ID']."&redirect_uri=" . urlencode($config['Redirect_url'])
                    . "&client_secret=".$config['APP_SECRET_KEY']."&code=" . $_GET['code'];
        $res = file_get_contents_curl($tokenUrl);
        $param = null;
        parse_str($res, $param);
        $graphUrl = "https://graph.facebook.com/v2.1/me?access_token="
                    . $param['access_token'];
        $_SESSION['token'] = $param['access_token'];
        $user = json_decode(file_get_contents_curl($graphUrl));
        $graphUrlGroups = "https://graph.facebook.com/v2.1/me/groups?access_token=".$_SESSION['token'];
        $groups = json_decode(file_get_contents_curl($graphUrlGroups));
        $dropdownGroupList = "";
        for($i=0;$i<count($allGroups->data);$i++){
            $dropdownGroupList .= "<option value='".$allGroups->data[$i]->access_token."-".$allGroups->data[$i]->id."'>".$allGroups->data[$i]->name."</option>";
        }
        $contentStyle = '<style>
                            #status {
                                width: 300px;
                                height: 25px;
                                font-size: 16px;
                            }
                        </style>'.$message.'
                        <form action="index.php" method="post">
                            Select Group you want to post status: <br>
                            <select name="group" id="status">'.$dropdownGroupList.'</select><br><br>
                            <input type="text" name="status" id="status" placeholder="" />
                            <input type="submit" value="Post On My Group!" style="padding: 5px;" />
                        <form>';
    } else {
        $contentMsg = 'Connect With
                        <a href="https://www.facebook.com/dialog/oauth?client_id='
                            .$config['APP_ID'].'&redirect_uri='
                            .$config['Redirect_url'].'&scope=email,user_about_me,publish_stream,publish_actions,user_groups">
                            <img src="./img/login.png" alt="Sign in with Facebook"/>
                        </a>';
    }
    echo $contentMsg;
    function file_get_contents_curl($url) {
        $c = curl_init();
        curl_setopt($c, CURLOPT_HEADER, 0);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1); //Set curl to return the data instead of printing it to the browser.
        curl_setopt($c, CURLOPT_URL, $url);
        $myData = curl_exec($c);
        curl_close($c);
        return $myData;
    }
?>