Variable scope or class problem

[Subhash]

Hello,
I have a Document class that stores the page url and raw content of
page as downloaded from that url.

The start() function creates an instance of Document class called $doc
and calls process(). The process($doc) function downloads the page and
stores the content in $doc->html and then calls the parse($doc)
function. All goes well here.

The problem is that when I try to echo the $doc->html in parse(),
nothing is displayed! I am clueless as to what the problem is? Please
help.

Thanks!

<?php

// Document class
class Document {
var $url; // url of the document
var $html; // raw content of page, as downloaded

function Document($_url) {
$this->url = $_url;
}
}

// Main function
function start() {
$doc = new Document("http://www.amazon.com");
process($doc);
}

// Downloads and parses
function process($doc) {
if(download($doc)) {
parse($doc);
}
}

// Returns 1 on successful download else returns 0
function download($doc) {
if(! ($file=fopen($doc->url,"r")) ) {
return 0;
}
while (!feof($file)) {
$doc->html = $doc->html . fread($file, 4096);
}
fclose($file);
return 1;
}

// Parse the page, right now just echo the page
function parse($doc) {
echo $doc->html;
}

start();

?>