get facebook page contents from access token - php

Question

I am trying to get facebook page contents using graph api in codeigniter. when I use access token in controller with a get function, I get the contents. But when I try to use graph url in view file, It's showing an error -- " Invalid OAuth access token"
In my controller, I tried this--
$response2 = $this->get('/me?fields=id,name,posts{actions,comments,message}',$accessToken);
echo "<pre>";
print_r($response2);
the get function is--
public function get($params, $accessToken){
try {
$response = $this->fb->get($params, $accessToken);
return json_decode($response->getBody());
} catch(Facebook\Exceptions\FacebookResponseException $e) {
return $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
return $e->getMessage();
}
}
Here I got the result .
but If I try to use it another view file--
<?php
foreach ($h->result() as $row) {
if ($row->social_network == 'facebook') {
$token = $row->token;
$id = $row->pid;
print_r($id);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/v15.0/$id?fields=posts%7Bmessage%2Ccomments%2Cactions%7D&access_token=$token');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close ($ch);
$result = json_decode($result);
print_r($result);
}
}
?>
Here I am getting the access token from database that I previously stored. Here It shows me an error--
Invalid OAuth access token - Cannot parse access token
How do I make It work?