PHP pagination not changing when next button is pressed - php

Question

I am trying to do a simple pagination where it'll retrieve data from MySQL and show a previous and next button, no numbers for counting pages, although once the next button is pressed no information are updated, I am not sure if I should use a while or foreach loop.
query
pageClass.php
public function classname
{
$start_page = 0;
$per_page = 8;
if(!isset($_GET['page']))
{
$page = 1;
} else {
$page = $_GET['page'];
}
if($page<=1)
$start_page = 0;
else
$start_page = $page * $per_page - $per_page;
$this->db->setAttribute(PDO::ATTR_EMULATE_PREPARES, FALSE);
$sth = $this->db->prepare("SELECT * FROM articles ORDER BY article_uid DESC LIMIT ?, ?");
$sth->execute(array($start_page, $per_page));
$row = $sth->fetchAll();
return $row;
}
then in a .php file I am displaying it this way, I get the titles but once the buttons are pressed, no other page is opened.
index.php
foreach($latestArticles as $article)
{
$title = $latest['title'];
echo '<div>'.$title.'</div>';
}
$prev = $page - 1;
$next = $page + 1;
echo "
<a href='?page=$prev'>prev</a>
<a href='?page=$next'>next</a>
";
I don't want to put div's in the php classes as it would be a pain to find each class in folders to edit. What am I doing wrong?

Answer 1

First i would recommend you to change your pageClass.php to something more abstract
<?PHP
class pageClass
{
private $db;
private $articlesPerPage = 8;
private $startPage = 0;
public function __construct($db)
{
#TODO check if $db is valid PDO
$this->db = $db;
}
public function setArticlesPerPage($articlesPerPage)
{
$this->articlesPerPage = $articlesPerPage;
}
public function setStartPage($startPage)
{
$this->startPage = $startPage;
}
public function getArticles()
{
$this->db->setAttribute(PDO::ATTR_EMULATE_PREPARES, FALSE);
$query = $this->db->prepare("SELECT * FROM articles ORDER BY article_uid DESC LIMIT ?, ?");
$queryResult = $query->execute(array($this->startPage, $this->articlesPerPage));
return $queryResult;
}
}
Try to change your index.php to the following
<?PHP
$page = (int)$_GET['page'];
$pageClass = new pageClass($pdo);
if($page > 0)
{
$pageClass->setStartPage($page);
}
$lastestArticles = $pageClass->getArticles();
foreach($lastestArticles as $article)
{
echo '<div>'.$article['title'].'</div>';
}
echo 'prev';
echo 'next';
?>
NOTE: THIS IS EXAMPLE CODE. YOU SHOULD EDIT IT BEFORE COMMITING TO PRODUCTION