Preserve leading zeros when saving numeric values in database

When executing dynamic MySQL prepared statements to INSERT or UPDATE, leading zeros (such as 0 in 0213123) disappear. How can I prevent this?

public function update($tablo, array $column, array $form)
{
    global $db;
    $sutun = implode(' = ?, ', array_keys($column)) . ' = ?';
    $where = implode(' = ?, ', array_keys($form)) . ' = ?';
    $stmt = $this->db->prepare("UPDATE $tablo SET $sutun  WHERE $where") or die($this->db->error);
    $form = array_merge($column, $form);
    call_user_func_array(array($stmt,'bind_param'), $this->params($form));
    return $stmt->execute() or die($this->db->error);
}

public function params($params, $types = '', $input = array())
{
    foreach ($params as $key => $val) {
        ${$key} = $val;
        $input[] =& ${$key};

        if (is_numeric($val) AND fmod($val, 1) === 0.00) {
            $types .= 'i';
        } elseif (is_float($val)) {
            $types .= 'd';
        } elseif (is_string($val) OR fmod($val, 1) !== 0.00) {
            $types .= 's';
        } else {
            $types .= 'b';
        }
    }
    array_unshift($input, $types);
    return $input;
}

This appears to be the behavior of the database. The column is likely a datatype that doesn't allow leading zeros, such as INT. Try changing that column to VARCHAR.