$value) { if ((!isset($key)) || ($value == '')) { return false; } } return true; } // Valid email function valid_email($address) { if (ereg('^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$',$address)) { return true; }else { return false; } } ?>

query("select * from user where username = '".$username."'"); if (!$results) { throw new Exception("Could not execute query",1); } if ($results -> num_rows > 0) { throw new Exception("That username is taken - go back and choose another one.",1); } $results = $conn -> query("insert into user values ('".$username."',sha1('".$email."'),'".$password."')"); if (!$results) { throw new Exception('Could not register you in database - please try again later.'); } return true; } // Log in function login($username,$password) { $conn = db_connect(); $results = $conn -> query("select * from user where username = '".$username."' and passwd = sha1('".$password."')"); if (!$results) { throw new Exception('Could not log you in.'); } if ($results -> num_rows > 0) { return true; }else { throw new Exception('Could not log you in.'); } } // Check valid user function check_valid_user() { if (isset($_SESSION['valid_user'])) { echo "Logged in as ".$_SESSION['valid_user'].".
"; }else { do_html_header('Problem:'); echo "You are not logged in.
"; do_html_url('login.php','Login'); do_html_foot(); exit; } } // change password function change_password($username,$old_password,$new_password) { login($username,$old_password); $conn = db_connect();

$result = $conn -> query("update user set passwd = sha1('".$new_password."') where username = '".$username."'");
if (!$result) {
throw new Exception('Password could not be changed.');
} else {
return true; // changed successfully
}
}
function get_random_word($min_length,$max_length) {
// grab a random word from dictionary between the two lengths
// and return it
// generate a random word
$word = '';
// remember to change this path to suit your system
$dictionary = '/usr/dict/words'; // the ispell dictionary
$fp = @fopen($dictionary,'r');
if(!$fp) {
return false;
}
$size = filesize($dictionary);
// go to a random location in dictionary
$rand_location = rand(0,$size);
fseek($fp,$rand_location);
// get the next whole word of the right length in the file
while ((strlen($word) < $min_length) || (strlen($word)>$max_length) || (strstr($word,"'"))) {
if (feof($fp)) {
fseek($fp,0); // if at end,go to start
}
$word = fgets($fp,80); // skip first word as it could be partial
$word = fgets($fp,80); // the potential password
}
$word = trim($word); // trim the trailing n from fgets
return $word;
}
function reset_password($username) {
// set password for username to a random value
// return the new password or false on failure
// get a random dictionary word b/w 6 and 13 chars in length
$new_password = get_random_word(6,13);

if($new_password == false) {
throw new Exception('Could not generate new password.');
}
// add a number between 0 and 999 to it
// to make it a slightly better password
$rand_number = rand(0,999);
$new_password .= $rand_number;
// set user's password to this in database or return false
$conn = db_connect();
$result = $conn->query("update user
set passwd = sha1('".$new_password."')
where username = '".$username."'");
if (!$result) {
throw new Exception('Could not change password.'); // not changed
} else {
return $new_password; // changed successfully
}
}
function notify_password($username,$password) {
// notify the user that their password has been changed
$conn = db_connect();
$result = $conn->query("select email from user
where username='".$username."'");
if (!$result) {
throw new Exception('Could not find email address.');
} else if ($result->num_rows == 0) {
throw new Exception('Could not find email address.');
// username not in db
} else {
$row = $result->fetch_object();
$email = $row->email;
$from = "From: support@phpbookmark rn";
$mesg = "Your PHPBookmark password has been changed to ".$password."rn"
."Please change it next time you log in.rn";
if (mail($email,'PHPBookmark login information',$mesg,$from)) {
return true;
} else {
throw new Exception('Could not send email.');
}
}
}
?>

query("select bm_URL from bookmark where username = '" . $username . "'"); if (!$results) { return false; } $url_array = array(); for ($i = 1;$row = $results -> fetch_row();++$i) { $url_array[$i] = $row[0]; } return $url_array; } // Add url to db function add_bm($new_url) { echo "Attempting to add ".htmlspecialchars($new_url)."
"; $valid_user = $_SESSION['valid_user']; $conn = db_connect(); $results = $conn -> query(" select * from bookmark where username = '".$valid_user."' and bm_URL = '".$new_url."'"); if ($results && ($results -> num_rows > 0)) { throw new Exception("Bookmark already exists.",1); } $insert_result = $conn -> query("insert into bookmark values ('".$valid_user."','".addslashes($new_url)."')"); if (!$insert_result) { throw new Exception("Bookmark could not be inserted.",1); } return true; } // Delete url function delete_bm($user,$url) { $conn = db_connect(); $results = $conn -> query(" delete from bookmark where username = '".$user."' and bm_URL = '".$url."'"); if (!$results) { throw new Exception("Bookmark could not be deleted.",1); } return true; } function recommend_urls($valid_user,$popularity = 1) { $conn = db_connect(); // $query = "select bm_URL // from bookmark // where username in // (select distinct(b2.username) // from bookmark b1,bookmark b2 // where b1.username='".$valid_user."' // and b1.username != b2.username // and b1.bm_URL = b2.bm_URL) // and bm_URL not in // (select bm_URL // from bookmark // where username='".$valid_user."') // group by bm_url // having count(bm_url)>".$popularity; $query = "select bm_URL from bookmark where username in (select distinct(b2.username) from bookmark b1,bookmark b2 where b1.username='".$valid_user."' and b1.username != b2.username and b1.bm_URL = b2.bm_URL) and bm_URL not in (select bm_URL from bookmark where username='".$valid_user."') group by bm_url having count(bm_url)>".$popularity; if (!($result = $conn->query($query))) { throw new Exception('Could not find any bookmarks to recommend.'); } if ($result->num_rows==0) { throw new Exception('Could not find any bookmarks to recommend.'); } $urls = array(); // build an array of the relevant urls for ($count=0; $row = $result->fetch_object(); $count++) { $urls[$count] = $row->bm_URL; } return $urls; } ?>

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BookmarkDelete? 0)) { foreach ($url_array as $url) { if ($color == "#cccccc") { $color = "#ffffff"; } else { $color = "#cccccc"; } //remember to call htmlspecialchars() when we are displaying user data echo "