index.php

<?php

/* 
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 */

require_once __DIR__ .'/../vendor/autoload.php';

use Dotenv\Dotenv;

// load envirionment variable
// add this package in your composer.json if want to use dotenv "vlucas/phpdotenv"
$env = new Dotenv(__DIR__ . '/../');
$env->load();

// set page
$fbSecretKey =  getenv('FB_SECRET_KEY');
$fbAppId = getenv('FB_APP_ID');
$fbPageName = getenv('FB_PAGENAME');
$accessToken = getenv('FB_ACCESS_TOKEN');

// Example 1
//$response = fb_feed()->setAppId($fbAppId)->setSecretKey($fbSecretKey)->setPage($fbPageName)->findKeyword("#tutorial")->fetch();
// Example 2
//$response = fb_feed()->setCredential($fbAppId, $fbSecretKey)->setPage($fbPageName)->findKeyword("#tutorial")->fetch();

// Example 3
//$response = fb_feed()->findKeyword("#tutorial")->fetch();

// Example 4
//$response = fb_feed()->findKeyword(['#tutorial', '#tips'])->fetch();

// Example 5 - to fetch owner's pages only. Apps review not required
$response = fb_feed()
    ->setAccessToken($accessToken)
    ->setPage("yourpage")
    ->setModule("posts")
    ->fields(["id","message","created_time","from","permalink_url","full_picture"])
    ->fetch();

// Example 6
//$response = fb_feed()->fetch();

header('Content-type: application/json');
echo json_encode($response, JSON_PRETTY_PRINT);