php file

<?php

//NOTE: THIS IS A SIMPLE SCRIPT I MADE WHICH GETS A LIST OF PDF FILES IN A DIRECTORY AND LOADS THE FILENAMES INTO AN XML DOCUMENT

//	THIS CLASS CHECKS THE URL VARIABLES, AND DECIDES WHETHER TO RUN THE SPIDER, OR DISPLAY THE XML FILE
class mainHandler {

	public function __construct() {

		$insert = '';

		$action = $_GET['action'];

		if ($action == "scrape") {
			$obj = new spider('single');
		}

		elseif ($action == "display") {
			$obj = new outputXML("data.xml");
		}

		$obj->outputPage();

	}

}

class pageDisplay {

	protected $page_body;

	function outputPage() {

		echo '<h1>Scraper</h1>';

		$page_body = $this->getProperty("page_body");

		echo $page_body;

	}

	public function setPageBody($page_body,$value) {

		$this->$page_body .= $value;

	}

	public function getPageBody() {

		return $this->$page_body;

	}

}

class spider extends pageDisplay {

//	THIS IS LIKE THE OPTIONS LIST WHERE THE USER CAN CHANGE THE WAY THE APPLICATION RUNS, I STILL DONT KNOW THE CORRECT WAY TO DO THIS
	function configData() {

		$file_data['xml_name'] = "chemistry1";
		$file_data['cats'] = array('science','chemistry');
		$file_data['doc_type'] = "book";
		$file_data['root_dir'] = "/home/files/books";

		return $file_data;

	}

	public function __construct() {

		$this->mainHandler();

	}

	function mainHandler() {

		//		THE MAIN FUNCTION THAT RUNS ALL THE OTHER FUNCTIONS

		$file_data = $this->configData();

		$cmd = "sudo ls -A " . $file_data['root_dir'];

		$scraped_data = $this->runSudoCommand($cmd,'password');

		$files = $this->generateFileList($file_data['root_dir'],$scraped_data);

		$this->generateXML($files,$file_data['xml_name'],$file_data);

		$this->displayOutput($files);

	}



	function runSudoCommand($cmd,$pwd) {

		// CODE OMITTED: THIS FUNCTION JUST RUNS THE LINUX LS COMMAND AND RETURNS THE OUTPUT

		return $cmd_output;

	}



	function generateFileList($cmd_dir,$scraped_data) {

		// CODE OMITTED: THIS FUNCTION JUST LOADS THE LIST OF FILES INTO AN ARRAY

		return $output;

	}


	function displayOutput($items) {

		$num_dirs = count($items['dir']);
		$num_docs = count($items['doc']);

		$this->setProperty("page_body","<p>Number of directories: $num_dirs</p>");


	}

	function generateXML($files,$xml_name,$file_data) {

		// CODE OMITTED: THIS FUNCTION LOADS THE FILES INTO AN XML FILE

	}


}


//	THIS FUNCTION IS TO DISPLAY THE CONTENTS ON THE XML FILE, HAVENT MADE IT YET
class outputXML extends pageDisplay {

	public function __construct($xml_file) {

	}

}

$obj = new mainHandler();
?>