I am trying to build a site with news links that can be voted, I have the following code:
case 'vote': require_once('auth/auth.php'); if(Auth::isUserLoggedIn()) { require_once('data/article.php'); require_once('includes/helpers.php'); $id = isset($_GET['param'])? $_GET['param'] : 0; if($id > 0) { $article = Article::getById($id); $article->vote(); $article->calculateRanking(); } if(!isset($_SESSION)) session_start(); redirectTo($_SESSION['action'], $_SESSION['param']); } else { Auth::redirectToLogin(); } break; The problem right now is how to check so the same user does not vote twice, here is the article file:
<?php require_once($_SERVER['DOCUMENT_ROOT'].'/config.php'); require_once(SITE_ROOT.'includes/exceptions.php'); require_once(SITE_ROOT.'data/model.php'); require_once(SITE_ROOT.'data/comment.php'); class Article extends Model { private $id; private $user_id; private $url; private $title; private $description; private $ranking; private $points; function __construct($title = ' ', $description = ' ', $url = ' ', $username = ' ', $created = ' ', $modified = '') { $this->setId(0); $this->setCreated($created); $this->setModified($modified); $this->setUsername($username); $this->setUrl($url); $this->setTitle($title); $this->setDescription($description); $this->setRanking(0.0); $this->setPoints(1); } function getId(){ return $this->id; } private function setId($value){ $this->id = $value; } function getUsername(){ return $this->username; } function setUsername($value){ $this->username = $value; } function getUrl(){ return $this->url; } function setUrl($value){ $this->url = $value; } function getTitle() { return $this->title; } function setTitle($value) { $this->title = $value; } function getDescription() { return $this->description; } function setDescription($value) { $this->description = $value; } function getPoints() { return $this->points; } function setPoints($value) { $this->points = $value; } function getRanking() { return $this->ranking; } function setRanking($value) { $this->ranking = $value; } function calculateRanking() { $created = $this->getCreated(); $diff = $this->getTimeDifference($created, date('F d, Y h:i:s A')); $time = $diff['days'] * 24; $time += $diff['hours']; $time += ($diff['minutes'] / 60); $time += (($diff['seconds'] / 60)/60); $base = $time + 2; $this->ranking = ($this->points - 1) / pow($base, 1.5); $this->save(); } function vote() { $this->points++; $this->save(); } function getUrlDomain() { /* We extract the domain from the URL * using the following regex pattern */ $url = $this->getUrl(); $matches = array(); if(preg_match('/http:\/\/(.+?)\//', $url, $matches)) { return $matches[1]; } else { return $url; } } function getTimeDifference( $start, $end ) { $uts['start'] = strtotime( $start ); $uts['end'] = strtotime( $end ); if( $uts['start']!==-1 && $uts['end']!==-1 ) { if( $uts['end'] >= $uts['start'] ) { $diff = $uts['end'] - $uts['start']; if( $days=intval((floor($diff/86400))) ) $diff = $diff % 86400; if( $hours=intval((floor($diff/3600))) ) $diff = $diff % 3600; if( $minutes=intval((floor($diff/60))) ) $diff = $diff % 60; $diff = intval( $diff ); return( array('days'=>$days, 'hours'=>$hours, 'minutes'=>$minutes, 'seconds'=>$diff) ); } else { echo( 'Ending date/time is earlier than the start date/time'); } } else { echo( 'Invalid date/time data detected'); } return( false ); } function getElapsedDateTime() { $db = null; $record = null; $record = Article::getById($this->id); $created = $record->getCreated(); $diff = $this->getTimeDifference($created, date('F d, Y h:i:s A')); //echo 'new date is '.date('F d, Y h:i:s A'); //print_r($diff); if($diff['days'] > 0 ) { return sprintf('hace %d dias', $diff['days']); } else if($diff['hours'] > 0 ) { return sprintf('hace %d horas', $diff['hours']); } else if($diff['minutes'] > 0 ) { return sprintf('hace %d minutos', $diff['minutes']); } else { return sprintf('hace %d segundos', $diff['seconds']); } } function save() { /* Here we do either a create or update operation depending on the value of the id field. Zero means create, non-zero update */ if(!get_magic_quotes_gpc()) { $this->title = addslashes($this->title); $this->description = addslashes($this->description); } try { $db = parent::getConnection(); if($this->id == 0 ) { $query = 'insert into articles (modified, username, url, title, description, points )'; $query .= ' values ('$this->getModified()', '$this->username', '$this->url', '$this->title', '$this->description', $this->points)'; } else if($this->id != 0) { $query = 'update articles set modified = NOW()'.', username = '$this->username', url = '$this->url', title = ''.$this->title.'', description = ''.$this->description.'', points = $this->points, ranking = $this->ranking where id = $this->id'; } $lastid = parent::execSql2($query); if($this->id == 0 ) $this->id = $lastid; } catch(Exception $e){ throw $e; } } function delete() { try { $db = parent::getConnection(); if($this->id != 0) { ; /*$comments = $this->getAllComments(); foreach($comments as $comment) { $comment->delete(); }*/ $this->deleteAllComments(); $query = 'delete from articles where id = $this->id'; } parent::execSql($query); } catch(Exception $e){ throw $e; } } static function getAll($conditions = ' ') { /* Retrieve all the records from the * database according subject to * conditions */ $db = null; $results = null; $records = array(); $query = 'select id, created, modified, username, url, title, description, points, ranking from articles $conditions'; try { $db = parent::getConnection(); $results = parent::execSql($query); while($row = $results->fetch_assoc()) { $r_id = $row['id']; $r_created = $row['created']; $r_modified = $row['modified']; $r_title = $row['title']; $r_description = $row['description']; if(!get_magic_quotes_gpc()) { $r_title = stripslashes($r_title); $r_description = stripslashes($r_description); } $r_url = $row['url']; $r_username = $row['username']; $r_points = $row['points']; $r_ranking = $row['ranking']; $article = new Article($r_title, $r_description , $r_url, $r_username, $r_created, $r_modified); $article->id = $r_id; $article->points = $r_points; $article->ranking = $r_ranking; $records[] = $article; } parent::closeConnection($db); } catch(Exception $e) { throw $e; } return $records; } static function getById($id) {/* * Return one record from the database by its id */ $db = null; $record = null; try { $db = parent::getConnection(); $query = 'select id, username, created, modified, title, url, description, points, ranking from articles where id = $id'; $results = parent::execSQL($query); if(!$results) { throw new Exception ('Record not found', EX_RECORD_NOT_FOUND); } $row = $results->fetch_assoc(); parent::closeConnection($db); if(!get_magic_quotes_gpc()) { $row['title'] = stripslashes($row['title']); $row['description'] = stripslashes($row['description']); } $article = new Article($row['title'], $row['description'], $row['url'], $row['username'], $row['created'], $row['modified']); $article->id = $row['id']; $article->points = $row['points']; $article->ranking = $row['ranking']; return $article; } catch (Exception $e){ throw $e; } } static function getNumberOfComments($id) {/* * Return one record from the database by its id */ $db = null; $record = null; try { $db = parent::getConnection(); $query = 'select count(*) as 'total' from comments where article_id = $id'; $results = parent::execSQL($query); if(!$results) { throw new Exception ('Comments Count Query Query Failed', EX_QUERY_FAILED); } $row = $results->fetch_assoc(); $total = $row['total']; parent::closeConnection($db); return $total; } catch (Exception $e){ throw $e; } } function deleteAllComments() {/* * Return one record from the database by its id */ $db = null; try { $db = parent::getConnection(); $query = 'delete from comments where article_id = $this->id'; $results = parent::execSQL($query); if(!$results) { throw new Exception ('Deletion Query Failed', EX_QUERY_FAILED); } parent::closeConnection($db); } catch (Exception $e){ throw $e; } } function getAllComments($conditions = ' ') { /* Retrieve all the records from the * database according subject to * conditions */ $conditions = 'where article_id = $this->id'; $comments = Comment::getAll($conditions); return $comments; } static function getTestData($url) { $page = file_get_contents($url); } } ?> Any suggestion or comment is appreciated, Thanks.
make another table user_votes for example with structure: user_id int not null article_id int not null primary key (user_id, article_id)
in vote function first try to insert and if insert is successfull then increase $this->points