When to use setters and getters

[Global Cooling]

Should I use a setter and getter function for every variable that is provided by the user?

i.e. I am writing a database class that has a:

public function select($fields, $table, $where, $orderby, $limit)

should I process each one of those function parameters i.e:

public function select($fields, $table, $where, $orderby, $limit){

$this->setFields($fields);
$this->setTable($table);
$this->setWhere($where);
$this->setOrderby($orderby);
$this->setLimit($limit);

//Rest of code here

Thanks in advance!!!
Global

P.S. I am aware that PHP frameworks offer these classes but I would like to know the best practices for myself...

[Global Cooling]

OK I was up late last night and my brain was little fried I do realise now that the variables should already be processed by the time they are included in a select mysql query.

[Wolf_22]

Been there a few times...

[PHPycho]

Should I use a setter and getter function for every variable that is provided by the user?

i.e. I am writing a database class that has a:

public function select($fields, $table, $where, $orderby, $limit)

should I process each one of those function parameters i.e:

public function select($fields, $table, $where, $orderby, $limit){

$this->setFields($fields);
$this->setTable($table);
$this->setWhere($where);
$this->setOrderby($orderby);
$this->setLimit($limit);

//Rest of code here

Thanks in advance!!!
Global

P.S. I am aware that PHP frameworks offer these classes but I would like to know the best practices for myself...

AFAIK:
Setters are used when
- you don't have publicly accessible properties
- you want to validate or do something extra with the properties

Getters are used when
- you want to validate or do something extra with the properties while accessing

If you have Zend Studio 7.0, it can generate getters and setters based on the properties.