How to Post in Facebook Group in PHP

In this blog you will learn 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;
    }
?>