<?php
require_once 'xmlHandler.php';
$datasize = $_POST["datasize"];
// 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
$xmlh = new xmlHandler("chatroom.xml");
// check if the chatroom XML data file exists
if (!$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, "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()) {
// if data size is changed,
// stop running this while loop to send messages to user
if ($_POST["datasize"] != filesize("chatroom.xml")) {
break;
}
}
// clear the internal cache of file system functions from php
