PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

604 Chapter 27 Building User Authentication and Personalization
Listing 27.26
Might Like
recommend.php— This Script Suggests Some Bookmarks That a User
Listing 27.27 recommend_urls()Function from url_fns.php—This Function
Works Out the Actual Recommendations
function recommend_urls($valid_user, $popularity = 1) {
// We will provide semi intelligent recommendations to people
// If they have an URL in common with other users, they may like
// other URLs that these people like
$conn = db_connect();
// find other matching users
// with an url the same as you
// as a simple way of excluding people's private pages, and
// increasing the chance of recommending appealing URLs, we
// specify a minimum popularity level
// if $popularity = 1, then more than one person must have
// an URL before we will recommend it
$query = "select bm_URL
from bookmark
where username in
(select distinct(b2.username)
from bookmark b1, bookmark b2
where b1.username='".$valid_user."'
and b1.username != b2.username
and b1.bm_URL = b2.bm_URL)
and bm_URL not in
(select bm_URL
from bookmark