如何访问私有财产/方法？ [关闭]

Question

I'm new to OOP programming and i'm trying to set up a private class db, for database connection:

My class:

class db
{
private $_db;

private function db()   
{
$this->db = new mysqli('localhost','x','x','x');
$this->db->set_charset('utf');
}
}

In another file I have the following code:

$db = new db();
                $sql = "SELECT news, DATE_FORMAT(date, '%D %b') AS date FROM news ORDER       
BY DATE_FORMAT(date, '%Y, %m, %d') DESC LIMIT 3";
                $r = $db->db->query($sql);
                while($row=$r->fetch_assoc())
                {
                    echo '<b>'. $row['date'] . '</b></br> ' . $row['news'] .'</br>   
</br>';
                }

It works grand for public but not for private.

I was reading that private methods can only be accessed within the class but can't really understand how to do it. Can anyone please give me a hint?

Regards Jack

Answer 1

I'm not sure why your method is private. Essentially, any methods you want to use external to the class should be public. This leads to the creation of getters and setters.

Getters return private variable fields and setters set those fields to new values. This is just a safe way to enforce types and cleanly accept class modification.