Fatal error: Uncaught Error: Class 'PDO' not found in /var/www/the_website.net/config/DB.php:20 Stack trace: #0 /var/www/the_website.net/public_html/index.php(16): DB->__construct() #1 {main} thrown in /var/www/the_website.net/config/DB.php on line 20

public function __construct($username='username', $password='supersecretpassword', $host='localhost', $dbname='database', $options=[])
{
    $this->isConnected = true;
    try {
        $this->db_data = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8",$username, $password, $options);
        $this->db_data->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $this->db_data->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    } catch (PDOException $e) {
        throw new Exception($e->getMessage());
    }
}

extension=openssl
extension=pdo_firebird
extension=pdo.so
extension=pdo_mysql
extension=pdo_oci
extension=pdo_odbc
extension=pdo_pgsql
extension=pdo_sqlite

root@HAL4:/etc/php/7.2/apache2# php -m
[PHP Modules]
calendar
Core
ctype
date
exif
fileinfo
filter
ftp
gettext
hash
iconv
json
libxml
mysqli
mysqlnd
openssl
pcntl
pcre
PDO <-- Still doesn't work
pdo_mysql <-- Nope. Still not working.
Phar
posix
readline
Reflection
session
shmop
sockets
sodium
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
Zend OPcache
zlib

[Zend Modules]
Zend OPcache