Can AJAX access PHP classes?

I’m trying to take input from a text field and use it to update data member $FavoriteColor using the member function ChangeColor($NewColor); without a page reload. Is AJAX equipped to access PHP classes?

Here’s the example class:

[code=php]
<?php

class TestClass
{
public $Name = “Joe”;
public $FavoriteColor = “Green”;

public function ChangeColor($NewColor)
{ $this->FavoriteColor = $NewColor; }

public function ShowInfo()
{ echo $this->Name . “‘s favorite color is ” . $this->FavoriteColor; }
}

$obj = new TestClass();
$obj->ChangeColor(“red”);
$obj->ShowInfo();
//output is “Joe’s favorite color is red”
?>

<input type=”text” id=”color”>
<input type=”button” onclick=”UpdateColor();” id=”submit”>
[/code]

Theoretically, UpdateColor() would do this…
-Dave

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