noob sql fetch array question

[keymistress]

i know how to do a normal php mysql fetch array but using vb3's codes, i'm lost!

can somebody guide me please... here's my not-working code:

PHP Code:

    global $vbulletin;

    $query = $vbulletin->db->query_read("SELECT * FROM mob WHERE memberID LIKE '$userId'");

    $result = $vbulletin->db->fetch_array($query);
    $result['smsCredits'] = $smsCredits;

    echo "My Credits: $smsCredits";
    $vbulletin->db->free_result($query); 


i can't get $smsCredits...