Ипатьев

$sql = "SELECT * FROM название таблицы WHERE  DATE = ?";
$result = $conn->execute_query($sql, [$dateNew]);
$usersArray = $result->fetch_all(MYSQLI_ASSOC);

SELECT * FROM название таблицы WHERE  DATE BETWEEN ? AND ?

To use a literal instance of a special character in a regular expression, precede it by two backslash (\) characters. The MySQL parser interprets one of the backslashes, and the regular expression library interprets the other.

Я только недавно начал изучать программирование

function listContactsByDepartment ($pdo){
    $sql = "SELECT 
    t3.department, -- обращаем внимание на эту строчку. Она должна быть первой
    t1.id,
    t1.full_name,
    t1.email_user,
    t1.tel_number,
    t2.filial,
    t3.department_email,
    t4.position,
    t5.number
    FROM contact_work AS t1 INNER JOIN filial_work AS t2  ON t1. id_filial = t2.id 
    INNER JOIN department_work AS t3 ON t1. id_department = t3.id
    INNER JOIN position AS t4 ON t1. id_position = t4.id
    INNER JOIN number_work AS t5 ON t1. id_number = t5.id
    ORDER BY `t2`.`filial` ASC , `t3`.`department` DESC ";
    return $pdo->query($sql)->fetchAll(PDO::FETCH_GROUP); # Обращаем внимание на эту константу
}
$contacts = listContactsByDepartment ($pdo);

<?php foreach($contacts as $department_title => $department_contacts): ?>
                      <tr>
                        <td colspan=10><?=htmlspecialchars($department_title) ?>
                      <tr>
    <?php foreach($department_contacts as $row): ?>
                      <tr>
                        <td><?=htmlspecialchars($row['filial']) ?></td>
                        ...
                      </tr>
    <?php endforeach ?>
<?php endforeach ?>

$query = "UPDATE `users` SET `address`= ?,`phone_number`=?  WHERE email=?";
$params = [
    $address,
    $phone_number,
    $email,
];
$stmt = $pdo->prepare($query);
$stmt->execute($params);

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

ini_set('display_errors', 0);
ini_set('log_errors', 1);