Get facebook page's public feed

facebookScrap.php

<?php 
function fetchUrl($url) {

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_TIMEOUT, 20);
	// You may need to add the line below
	// curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);

	$feedData = curl_exec($ch);
	curl_close($ch);

	return $feedData;
}

function graph_scrapper() {

	$profile_id = PROFILE_ID;

//App Info, needed for Auth
	$app_id = "APP_ID";
	$app_secret = "APP_SECRET";

//Retrieve auth token
	$authToken = fetchUrl("https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id={$app_id}&client_secret={$app_secret}");

	$json_object = fetchUrl("https://graph.facebook.com/{$profile_id}/feed?{$authToken}&?fields=full_picture");

	$decode_feed = json_decode($json_object);

	return $decode_feed;
}

function get_latest_post() {

	$page_feeds = graph_scrapper();

	$latest_feed = $page_feeds->data[0];

	$single_feed = fetchUrl("https://graph.facebook.com/" . $latest_feed->id);

	$decode_single = json_decode($single_feed);
	return $decode_single;
}

function get_feed_picture($single_feed, $type = 'normal') {

	/* https://graph.facebook.com/{object_id}/picture?type=normal

	  Where type can be : thumbnail, normal, album. */
	return 'https://graph.facebook.com/' . $single_feed->id . '/type=' . $type;
}



function get_all_post() {
	//Get feeds between 3 months
	$param = array();
	$param['until'] = strtotime(date('Y-m-d H:i:s'));
	$param['since'] = strtotime(date('Y-m-d H:i:s', strtotime("-3 months", strtotime($param['until']))));

	$page_feeds = graph_scrapper($param);

	foreach ($page_feeds as $feed):
		?>
		<div class='content-facebook'>
			<p>	
				<a href="<?php echo $feed->link; ?>">
					<img width="150" height="116" alt="facebook-img-placeholder" src="<?php echo $feed->picture ?>" class="alignleft size-full wp-image-49">
				</a>
				<?php echo $feed->message; ?>
			</p>
			<p>&nbsp;</p>
			<p><a target ="_blank" href="https://facebook.com/<?php echo $feed->id; ?>">Read More</a></p>
		</div>
		<?php
	endforeach;
}

Is there any Public Feed API token available?