[facebook] How do you post to the wall on a facebook page (not profile)

You can make api calls by choosing the HTTP method and setting optional parameters:

$facebook->api('/me/feed/', 'post', array(
    'message' => 'I want to display this message on my wall'
));

Submit Post to Facebook Wall :

Include the fbConfig.php file to connect Facebook API and get the access token.

Post message, name, link, description, and the picture will be submitted to Facebook wall. Post submission status will be shown.

If FB access token ($accessToken) is not available, the Facebook Login URL will be generated and the user would be redirected to the FB login page.

Post to facebook wall php sdk

<?php
//Include FB config file
require_once 'fbConfig.php';

if(isset($accessToken)){
    if(isset($_SESSION['facebook_access_token'])){
        $fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
    }else{
        // Put short-lived access token in session
        $_SESSION['facebook_access_token'] = (string) $accessToken;

        // OAuth 2.0 client handler helps to manage access tokens
        $oAuth2Client = $fb->getOAuth2Client();

        // Exchanges a short-lived access token for a long-lived one
        $longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($_SESSION['facebook_access_token']);
        $_SESSION['facebook_access_token'] = (string) $longLivedAccessToken;

        // Set default access token to be used in script
        $fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
    }

    //FB post content
    $message = 'Test message from CodexWorld.com website';
    $title = 'Post From Website';
    $link = 'http://www.codexworld.com/';
    $description = 'CodexWorld is a programming blog.';
    $picture = 'http://www.codexworld.com/wp-content/uploads/2015/12/www-codexworld-com-programming-blog.png';

    $attachment = array(
        'message' => $message,
        'name' => $title,
        'link' => $link,
        'description' => $description,
        'picture'=>$picture,
    );

    try{
        //Post to Facebook
        $fb->post('/me/feed', $attachment, $accessToken);

        //Display post submission status
        echo 'The post was submitted successfully to Facebook timeline.';
    }catch(FacebookResponseException $e){
        echo 'Graph returned an error: ' . $e->getMessage();
        exit;
    }catch(FacebookSDKException $e){
        echo 'Facebook SDK returned an error: ' . $e->getMessage();
        exit;
    }
}else{
    //Get FB login URL
    $fbLoginURL = $helper->getLoginUrl($redirectURL, $fbPermissions);

    //Redirect to FB login
    header("Location:".$fbLoginURL);
}

Refrences:

https://github.com/facebookarchive/facebook-php-sdk

https://developers.facebook.com/docs/pages/publishing/

https://developers.facebook.com/docs/php/gettingstarted

http://www.pontikis.net/blog/auto_post_on_facebook_with_php

https://www.codexworld.com/post-to-facebook-wall-from-website-php-sdk/