HTML code in OOP PHP file - php

Question

I want to get some advice of using PHP OOP.
For example I'm createing some PHP/MySQL code using OOP and I need to output the code, how to do it?
I might have been bit confusing, I will show you all the code and you tell me if I do it right:
index.php
<?php
require_once CLASSES."Pages.Class.php";
$obj = new Pages;
if (isset($_GET['page'])) {
$obj->setPage($_GET['page']);
echo $obj->getPage();
} else {
echo $obj->getFrontPage();
}
?>
Pages.Class.php - one function from it
public function getDatabasePage() {
global $conn;
$sql = "SELECT * FROM pages WHERE page_seo_title = '$this->pageId' LIMIT 1";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
?>
<div class="col-xs-12 col-sm-12 col-md-12">
<div class="well">
<div class="page-head">
<?php echo $row["page_title"]; ?>
</div>
</div>
</div>
<div class="col-xs-12 col-sm-12 col-md-12">
<div class="well">
<div class="page-content">
<?php echo $row["page_content"]; ?>
</div>
</div>
</div>
<?php
}
} else {
echo "0 results";
}
}
So basiclly the question is: Where do I need to put HTML code?
In the index.php file or in the pages.class.php file?
How to do this right? Maybe I can get some links with documentation about this from you :) ..
Thanks.
btw - code is an example, not fully done. Just as example - I know it's not right as it is :D

Answer 1

In your Pages class, create a separate method that outputs HTML and does only that; the DB-related logic should be in another method or (preferably) in a totally separate class.
class Pages {
public function __construct(){
//Object initialization logic comes here
}
public function getOutputHTML($resultOfQuery = ''){
return "<div> Your html </div>";
}
}
Other class file only for DB access , just pass parameter and get result as Database result.
class DB {
public function insertMethod($table,$fields,$where){
//Your logic
}
public function updateMethod($table,$fields,$where){
//Your logic
}
public function deleteMethod($table,$fields,$where){
//Your logic
}
public function selectMethod($table,$fields,$where){
//Your logic
}
}
Instantiate DB class like $dbObj = new DB();
Then you can access DB methods like $resultQuery = $dbObj.selectMethod('users');
So you can pass the $resultQuery result to other method like : $objPages = new Pages();$objPages.getoutputHTML($resultOfQuery); . It separates the Database and HTML logic/functionality.
I recommand you to use OOP with MVC so there will be templating system like Smarty,Blade etc.