Instagram authenticaton for self feed? - php

Question

I'm trying to get photos from my Instagram-Feed but everytime Il have to login in my Authentication-Popup, although i use my access token from DB
//FIRST TIME
$array = array(
'client_id'=>'XXX',
'client_secret' => 'XXX',
'grant_type' => 'authorization_code',
'redirect_uri' => REDIRECT_URL,
'code' => $_GET['code']
);
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch,CURLOPT_POSTFIELDS, $array);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$res = curl_exec($ch);
$access_token = $res['access_token'];
//SAVE ACCESS_TOKEN INTO DB
//NEXT TIME
$url = 'https://api.instagram.com/v1/users/self/feed?access_token='.$db['access_token'].'&client_id='.$array['client_id'].'&client_secret='.$array['client_secret'];
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_HTTPGET, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$res = curl_exec($ch);
What am I doing wrong?

Answer 1

Sorry, there was a mistake in the lines above this.
I requested the code every time and this redirect shows me the login form.
Before:
if(!isset($_GET['code'])) {
header('location: https://api.instagram.com/oauth/authorize/?client_id=xxx&redirect_uri='.REDIRECT_URL.'&response_type=code');
}else{
$url = 'https://api.instagram.com/oauth/access_token/';
// ...
After:
if(!isset($_GET['code']) && !isset($access_token) ) {
header('location: https://api.instagram.com/oauth/authorize/?client_id=xxx&redirect_uri='.REDIRECT_URL.'&response_type=code');
}else{
$url = 'https://api.instagram.com/oauth/access_token/';
// ...
Now it works fine.