I need a class on classes.

Houdini

This script works but I am not sure if I am thinking right about using classes. Using it as is since the script to produce the page has created a new instance of the class 'Page' then Page is the current object right? I tried running it by using $this->Title="whatever"; and so on but it produced an error. Also suppose that instead of having the script at the bottom of the class and used the class in an include would $this->whatever work, I can not seem to fully comprehend using the class properly.

<?php
class Page {
   var $Title;
   var $Keywords;
   var $Content;

   function Display( ) {
     echo "<HTML>\n<HEAD>\n";
     $this->DisplayTitle( );
     $this->DisplayKeywords( );
     echo "\n</HEAD>\n<BODY>\n";
     echo $this->Content;
     echo "\n</BODY>\n</HTML>\n";
   }

   function DisplayTitle( ) {
     echo "<TITLE>" . $this->Title . "</TITLE>\n";
   }

   function DisplayKeywords( ) {
     echo '<META NAME="keywords" CONTENT="' . $this->Keywords . '">';
   }

   function SetContent( $Data ) {
     $this->Content = $Data;
   }
 }
 $test = new Page;
 $Data="This is a test of the class to see if this stuff is right or not!";
 $test->Title= "Tesing the class!";
 $test->Keywords= "Classes,PHP,more stuff,CSS";
 $test->SetContent($Data);
 $test->Display();

?>

Installer

It looks to me like you're using the class properly. If you're confused about the use of "$this": "$this" is a stand-in for the name of the object calling the class method, and is used only inside the class definition (as in your code). For instance:

$obj_1 = new Page;
$obj_2 = new Page;
$obj_1->setContent('Object 1');
$obj_2->setContent('Object 2');

In each of these cases, "$this", in the class method definition, stands for the calling ("current") object, "$obj_1" in the first case, and "$obj_2" in the second case.

Classes are often kept in separate files, with names like "Page.class.php", then included in scripts that use them.