PHP Class Structure

โพสเก็บไว้ เผื่อใช้อ้างอิงตอนหลัง PHP class structure ครับ

class Page {
var $Title;
var $Keywords;
var $Content;

function Display( ) {
 echo "\n\n";
 $this->DisplayTitle( );
 $this->DisplayKeywords( );
 echo "\n\n\n";
 echo $this->Content;
 echo "\n\n\n";
}

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

function DisplayKeywords( ) {
 echo '<meta name="keywords" content="">. $this->Keywords . '">';
}

function SetContent( $Data ) {
 $this->Content = $Data;
}
}

Now, at first glance this looks pretty simple. And you know what? It is. Its just basic PHP code wrapped into a class. Let me point a few things out before we go any farther though.

VAR -
All variables declared in the class must be placed at the top of the class structure, and preceeded with the VAR statement.

$THIS -
$this is a variable that incidates the current object. That way, the object knows how to find itself while running functions contained within it.
For instance, $this->Keywords gets the data from the $Keywords variable in the object. You'll also notice that when using variables contained
within a class, you can't use the $ to reference them - But you have to use it to reference the object itself.