pdo

<?php

$dsn      = 'mysql:host=db;dbname=pdo';
$user     = 'root';
$password = 'secret';

$options = [
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
];

try {
    $pdo = new PDO($dsn, $user, $password, $options);
} catch (Exception $e) {
    throw new PDOException($e->getMessage());
}

// Query database with prepare & execute to avoid sql injection
$stmt = $pdo->prepare('select * from users where email = :email');
$stmt->execute([
    'email' => 'marcin@yasiu.pl',
]);

$user = $stmt->fetch();

var_dump($user);