How to Use Facebook API to Post on Your Page via PHP

Install Facebook PHP SDK

• Use Composer to include Facebook PHP SDK in your project. This SDK will handle authorization and facilitate API calls to post on your page.

composer require facebook/graph-sdk

Generate Access Token

• Go to the Facebook Developer portal and navigate to the "Access Tokens" section under your app's settings.

 

• Generate a Page Access Token with the appropriate permissions (e.g., `manage_pages`, `publish_pages`). This is a necessary step for programmatically posting to Facebook.

Initialize Facebook SDK in PHP

• Start by including the Composer autoload file in your PHP script to make use of the Facebook SDK classes.

 

• Create a new instance of the Facebook class and configure it with your app credentials.

require_once __DIR__ . '/vendor/autoload.php'; // Change path as needed

$fb = new \Facebook\Facebook([
  'app_id' => 'your-app-id',
  'app_secret' => 'your-app-secret',
  'default_graph_version' => 'v3.2',
  //'default_access_token' => '{access-token}', // optional
]);

Create the Post Content

• Decide what content you want to post. This could be text, a link, an image, or a combination thereof.

 

• Prepare an array with the appropriate parameters to create a post. Each parameter needs to be carefully aligned with Facebook's API specifications.

$data = [
  'message' => 'Hello, this is a post from my PHP app!',
  'link' => 'https://www.example.com', // Optional: attach a link
  //'source' => $fb->fileToUpload('/path/to/photo.jpg'), // Optional: attach an image
];

Post to Your Facebook Page

• Use the Page Access Token you obtained earlier to authorize your request.

 

• Make a POST request to the `/me/feed` endpoint to publish your content. Ensure to handle exceptions to catch API errors.

try {
  // Returns a `Facebook\FacebookResponse` object
  $response = $fb->post('/me/feed', $data, '{access-token}');
} catch(\Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(\Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

$graphNode = $response->getGraphNode();

echo 'Posted with id: ' . $graphNode['id'];

Verify Post and Handle Response

• Check the response object to confirm that there is no error during the post-operation, ensuring your content was successfully published to your Facebook Page.

 

• Retrieve the post ID from the response to confirm your post's presence on Facebook and for future reference.