Please help me understand what this code does in pseudo form.

[PHinett]

Hi all...

 

I am an experienced Asp.Net developer, but I need to convert a PHP script to ASP.net.

 

I'm not looking for someone to do the whole conversion, i just need some help understanding what it's actually doing.

 

$items .= <<<EOD
				   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

 

$_SESSION['chatHistory'][$chat['from']] .= <<<EOD
					   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

 

foreach ($_SESSION['openChatBoxes'] as $chatbox => $time) {
	if (!isset($_SESSION['tsChatBoxes'][$chatbox])) {
		$now = time()-strtotime($time);
		$time = date('g:iA M dS', strtotime($time));

		$message = "Sent at $time";
		if ($now > 180) {
			$items .= <<<EOD
{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;

if (!isset($_SESSION['chatHistory'][$chatbox])) {
	$_SESSION['chatHistory'][$chatbox] = '';
}

$_SESSION['chatHistory'][$chatbox] .= <<<EOD
	{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;
		$_SESSION['tsChatBoxes'][$chatbox] = 1;
	}
	}
}
}

 

Thank you very much in advanced i really appreciate your help!

 

Paul Hinett

House-Mixes.com

[ohdang888]

$items .= <<<EOD
				   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

This is assembling JSON and adding it to the content already stored in "items". The $chat['from'] and ['message'] are unique variables.

 

$_SESSION['chatHistory'][$chat['from']] .= <<<EOD
					   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

This is storing the JSON created in the previous example into the global array of $_SESSION

 

I'll come back alter and finish the rest...i have to be at work in 19 minutes

[PHinett]

Thank you for  that...i understand the string building for JSON now.

 

However, i'm not sure on the last piece of code...the part i am struggling with is the foreach part:

 

	foreach ($_SESSION['openChatBoxes'] as $chatbox => $time) {
}

 

If you are interested the full script is here which i am trying to convert:

 

<?php

/*

Copyright (c) 2009 Anant Garg (anantgarg.com | inscripts.com)

This script may be used for non-commercial purposes only. For any
commercial purposes, please contact the author at 
[email protected]

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/

define ('DBPATH','localhost');
define ('DBUSER','root');
define ('DBPASS','password');
define ('DBNAME','chat');

session_start();

global $dbh;
$dbh = mysql_connect(DBPATH,DBUSER,DBPASS);
mysql_selectdb(DBNAME,$dbh);

if ($_GET['action'] == "chatheartbeat") { chatHeartbeat(); } 
if ($_GET['action'] == "sendchat") { sendChat(); } 
if ($_GET['action'] == "closechat") { closeChat(); } 
if ($_GET['action'] == "startchatsession") { startChatSession(); } 

if (!isset($_SESSION['chatHistory'])) {
$_SESSION['chatHistory'] = array();	
}

if (!isset($_SESSION['openChatBoxes'])) {
$_SESSION['openChatBoxes'] = array();	
}

function chatHeartbeat() {

$sql = "select * from chat where (chat.to = '".mysql_real_escape_string($_SESSION['username'])."' AND recd = 0) order by id ASC";
$query = mysql_query($sql);
$items = '';

$chatBoxes = array();

while ($chat = mysql_fetch_array($query)) {

	if (!isset($_SESSION['openChatBoxes'][$chat['from']]) && isset($_SESSION['chatHistory'][$chat['from']])) {
		$items = $_SESSION['chatHistory'][$chat['from']];
	}

	$chat['message'] = sanitize($chat['message']);

	$items .= <<<EOD
				   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

if (!isset($_SESSION['chatHistory'][$chat['from']])) {
	$_SESSION['chatHistory'][$chat['from']] = '';
}

$_SESSION['chatHistory'][$chat['from']] .= <<<EOD
					   {
		"s": "0",
		"f": "{$chat['from']}",
		"m": "{$chat['message']}"
   },
EOD;

	unset($_SESSION['tsChatBoxes'][$chat['from']]);
	$_SESSION['openChatBoxes'][$chat['from']] = $chat['sent'];
}

if (!empty($_SESSION['openChatBoxes'])) {
foreach ($_SESSION['openChatBoxes'] as $chatbox => $time) {
	if (!isset($_SESSION['tsChatBoxes'][$chatbox])) {
		$now = time()-strtotime($time);
		$time = date('g:iA M dS', strtotime($time));

		$message = "Sent at $time";
		if ($now > 180) {
			$items .= <<<EOD
{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;

if (!isset($_SESSION['chatHistory'][$chatbox])) {
	$_SESSION['chatHistory'][$chatbox] = '';
}

$_SESSION['chatHistory'][$chatbox] .= <<<EOD
	{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;
		$_SESSION['tsChatBoxes'][$chatbox] = 1;
	}
	}
}
}

$sql = "update chat set recd = 1 where chat.to = '".mysql_real_escape_string($_SESSION['username'])."' and recd = 0";
$query = mysql_query($sql);

if ($items != '') {
	$items = substr($items, 0, -1);
}
header('Content-type: application/json');
?>
{
	"items": [
		<?php echo $items;?>
        ]
}

<?php
		exit(0);
}

function chatBoxSession($chatbox) {

$items = '';

if (isset($_SESSION['chatHistory'][$chatbox])) {
	$items = $_SESSION['chatHistory'][$chatbox];
}

return $items;
}

function startChatSession() {
$items = '';
if (!empty($_SESSION['openChatBoxes'])) {
	foreach ($_SESSION['openChatBoxes'] as $chatbox => $void) {
		$items .= chatBoxSession($chatbox);
	}
}


if ($items != '') {
	$items = substr($items, 0, -1);
}

header('Content-type: application/json');
?>
{
	"username": "<?php echo $_SESSION['username'];?>",
	"items": [
		<?php echo $items;?>
        ]
}

<?php


exit(0);
}

function sendChat() {
$from = $_SESSION['username'];
$to = $_POST['to'];
$message = $_POST['message'];

$_SESSION['openChatBoxes'][$_POST['to']] = date('Y-m-d H:i:s', time());

$messagesan = sanitize($message);

if (!isset($_SESSION['chatHistory'][$_POST['to']])) {
	$_SESSION['chatHistory'][$_POST['to']] = '';
}

$_SESSION['chatHistory'][$_POST['to']] .= <<<EOD
				   {
		"s": "1",
		"f": "{$to}",
		"m": "{$messagesan}"
   },
EOD;


unset($_SESSION['tsChatBoxes'][$_POST['to']]);

$sql = "insert into chat (chat.from,chat.to,message,sent) values ('".mysql_real_escape_string($from)."', '".mysql_real_escape_string($to)."','".mysql_real_escape_string($message)."',NOW())";
$query = mysql_query($sql);
echo "1";
exit(0);
}

function closeChat() {

unset($_SESSION['openChatBoxes'][$_POST['chatbox']]);

echo "1";
exit(0);
}

function sanitize($text) {
$text = htmlspecialchars($text, ENT_QUOTES);
$text = str_replace("\n\r","\n",$text);
$text = str_replace("\r\n","\n",$text);
$text = str_replace("\n","<br>",$text);
return $text;
}

 

Thank you once again!!

 

Paul

[J.Daniels]

foreach

 

foreach ($_SESSION['openChatBoxes'] as $chatbox => $time) {

 

foreach iterates over the array $_SESSION['openChatBoxes'] and assigns the keys of the array to $chatbox and their values to $time