The best and most secure way to echo results with pdo - php

Question

Hi i am new to PDO and i just learn how to make a Query, i have read a lot about this everywhere on the internet, without luck, and then i tryed this, but i am still wondering if this is the right way to do it? How is the best way to make this to a class, because when i tryed, i did not got any kind of error, and any respond either.
<?php
require_once 'dbconfig.php';
// (echo test) $name_structure='%s';
// (echo test) $title_structure='%s';
try {
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$sql = 'SELECT *
FROM portfolio';
$q = $conn->prepare($sql);
$q->execute(array('%son'));
$q->setFetchMode(PDO::FETCH_ASSOC);
while ($r = $q->fetch()) {
echo sprintf($name_structure, $r['name']);
echo sprintf($title_structure, $r['title']);
echo sprintf($description_structure, $r['description']);
echo sprintf($img_structure, $r['img']);
echo sprintf($project_end_structure, $r['project_end']);
}
} catch (PDOException $pe) {
die("Could not connect to the database $dbname :" . $pe->getMessage());
}

Answer 1

As you forgot to explain what is "this" you are trying, here are two possible scenarios:
In case "this" is for getting all the records from database, the code would be
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$stmt = $conn->query('SELECT * FROM portfolio');
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo $row['name'];
echo $row['title'];
echo $row['description'];
echo $row['img'];
echo $row['project_end'];
}
in case "this" is about selecting only certain records, code it as follows
$conn = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$stmt = $conn->prepare('SELECT * FROM portfolio WHERE name LIKE ?');
$stmt->execute(array('%son'));
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo $row['name'];
echo $row['title'];
echo $row['description'];
echo $row['img'];
echo $row['project_end'];
}
How is the best way to make this to a class,
PDO is already a class, mind you. So, insead of making it into another, just learn how to use PDO.
i have read a lot about this everywhere on the internet, without luck,
Here you go, I wrote a tutorial that makes sense (at least for anyone who have basic PHP/SQL training), The only proper guide on PDO