Can't insert into DB

Not sure why, I can't process the PHP. The script connects fine but I can't insert the entries in to the DB:

   $fullname = mysql_escape_string($_POST['name']);
   $title = mysql_escape_string($_POST['title']);
   $email = mysql_escape_string($_POST['email']);
   $uname = mysql_escape_string($_POST['username']);
   $password = mysql_escape_string($_POST['password']);



    $insert = "INSERT INTO human_network (Employee_id, Name, Title, Email, Username, 
    Password, Date_time_created)
    VALUES ('".$eid."','".$_POST['name']."', '".$title."', '".$email."', 
    '".$uname."', '".$password."', '".$createddate."')";
     $add_member = mysql_query($insert);

Upon checking further this 开发者_运维问答is the error I get:

Invalid query: Access denied for user 'www-data'@'localhost' (using password: NO)

as of the error: check your mysql user permissions. user www-data seems not to have the permission to execute INSERT