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[eluser]spfortier[/eluser]
You don't necessarily need to use private, it just provides a level of security to keep you from accidentally overwriting the value stored in the variable as it hides the variable from anything outside the class. It also promotes a better programming style. I generally use "getters" and "setters" to pass values to and from my models.

Code:

class Test {
  private $test_var;

  public function setTestVar($test_var) {$this->test_var = $test_var;}
  public function getTestVar() {return $this->test_var;}
}

$test = new Test();
$test->setTestVar('Hello world!');
echo $test->getTestVar();