server.php

shooting flash game with script

<?php

require_once('xmlHandler.php');
$datasize = $_POST["datasize"];
$fn_xml = "chatroom.xml";

	// set the execution time limit for this php session to 60 seconds (default is in php.ini)
	set_time_limit(60);
		
	// create the chatroom xml file handler
	$xmlh = new xmlHandler($fn_xml);
	
	// check if the chatroom XML data file exists
	if (!$xmlh->fileExist()) {
		
		// create new XML file
		$xmlh->openFile();

		// create a 'chatroom' element, as root element
		$root = $xmlh->addRootElement("chatroom");
					
		// create a 'messages' element for the set of messages
		$xmlh->addElement($root, "users");
		$xmlh->addElement($root, "agentactions");
		$xmlh->addElement($root, "messages");
					
		// save the XML file
		$xmlh->saveFile();
	}
	
	$start = gettimeofday();
	
	while (1) {
		// if the file size of chatroom.xml is changed, that means new message has been added
		if ($xmlh->fileExist()) {
			
			// get the input from the POST data 'datasize=xxx' sent from chatroom.js
			// it will be stored in variable $datasize
			// parse_str($HTTP_RAW_POST_DATA);
			
			// if data size is changed,
			// and stop running this while loop to send messages to user
			if ($_POST["datasize"] != filesize($fn_xml)) {
				break;
			}
		}

		// clear the internal cache of file system functions from php
		clearstatcache();

		// we are not going to run the loop for more than 30 seconds
		$time = gettimeofday();
		if ($time["sec"] - $start["sec"] > 30) break;
		
		// stop running the while loop for a second
		sleep(1);
	}

	$output = "";
	
	// output the content of chatroom.xml as XML message
	if ($xmlh->fileExist()) {
		
		// open the existing XML file
		$xmlh->openFile();
		
		// get all the elements in the XML file
		$output = $xmlh->dumpToString();
	}
	
	// print the XML output	
	print $output;
?>