php pdo category level access - php

Question

i want category level access to users, i will give from admin side which categories users should access and which are not. Here i have trouble please help me, here is my code
In my database permission table there, in that userid and catids fields there so user if click on category function will see in permission table if user has permission are not then it will dipplay.
public function Grants($username)
{
$q = $this->db->prepare("select * from permissions where user = ?");
$q->bindParam(1, $username);
$q->execute();
$results = $q->fetchAll();
return $results;
}
category page
$check = new Access;
$data = $check->Grants($user);
foreach($data as $v)
{
if($v['catid'] == $_GET['p'])
{
foreach($nav as $list)
{
echo '' . '<li style="display:inline; padding:10px;">' . $list['catname'] . '</li>' . '';
}
}
else{
echo 'Access Denied'; }
}
if i had only one category in permission table it is working fine, if user had two or more catids not working.
Permission table example:
User>1 catid>1,2,3 array model giving problem how do i solve please help, if i place only one category it is working.

Answer 1

If your data is stored as I think it is from what you posted, it would look like this:
------------------------
| User | catid |
------------------------
1 1,2,3
Am I right? If that is the case. Then when you call this:
$check = new Access;
$data = $check->Grants($user);
Your $data variable would contain something like this:
1,2,3
and NOT an array as you think it would.
What you should do is use explode() to create that url:
$check = new Access;
$data = explode(',', $check->Grants($user));
Which, in turn; should give you an array like this:
Array (
[0] => 1,
[1] => 2,
[2] => 3,
)
Allowing you to iterate as you require.
EDIT
As per your comment, you need to access the catid array element. Provided you have the right php version, you could simple do this:
$check = new Access;
$data = explode(',', $check->Grants($user)[0]['catid']);
Or if that throws error, try this:
$check = new Access;
$cats = $check->Grants($user);
$data = explode(',', $cats[0]['catid']);

Answer 2

I have found simple solution for this.
$check = new Access;
$data = $check->Grants($user);
foreach($data as $result)
{
$str = $result['catid'];
$string = explode(',' , $str);
}
if(in_array($_GET['p'], $string))
{
foreach($nav as $list)
{
echo '' . '<li style="display:inline; padding:10px;">' . $list['catname'] . '</li>' . '';
}
}
else { echo "You dont have permission"; }