What are some best practices for creating a Facebook app using PHP for posting on a user's wall?

When creating a Facebook app using PHP to post on a user's wall, it is important to follow best practices to ensure the security and functionality of the app. One key practice is to use the Facebook Graph API to authenticate the user and obtain the necessary permissions before posting on their behalf. Additionally, make sure to handle any errors or exceptions that may occur during the posting process to provide a smooth user experience.

<?php

// Include the Facebook SDK
require_once 'facebook-php-sdk/autoload.php';

// Initialize the Facebook SDK with your app credentials
$fb = new Facebook\Facebook([
  'app_id' => 'your_app_id',
  'app_secret' => 'your_app_secret',
  'default_graph_version' => 'v11.0',
]);

// Get the user's access token after they have authenticated with your app
$access_token = 'user_access_token';

// Make a POST request to post on the user's wall
try {
  $response = $fb->post('/me/feed', ['message' => 'Your message here'], $access_token);
  $graphNode = $response->getGraphNode();
  echo 'Posted with id: ' . $graphNode['id'];
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
}

?>