What does this PHP code do?

[akz645]

Hi, can somebody please help me understand what the PHP code below is meant to do?

<?php

// ####################### SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE);

// #################### DEFINE IMPORTANT CONSTANTS #######################
define('THIS_SCRIPT', 'index');
define('CSRF_PROTECTION', true);
define('CSRF_SKIP_LIST', '');
define('VB_ENTRY', 'forum.php');

// ################### PRE-CACHE TEMPLATES AND DATA ######################
// get special phrase groups
// pre-cache templates used by all actions
$globaltemplates = array(
'ws_contact_forum',
);

// pre-cache templates used by specific actions
$actiontemplates = array();

// ######################### REQUIRE BACK-END ############################
require_once('./global.php');
require_once(DIR . '/includes/functions.php');
$haserror = 0;
$thanks = 0;
if (isset($_POST['btnsubmit'])) {
$to = $vbulletin->options['ws_contact_us'];


$vbulletin->input->clean_array_gpc('r', array(
'first_name' => TYPE_STR,
'last_name' => TYPE_STR,
'email' => TYPE_STR,
'internationalCode' => TYPE_STR,
'phone' => TYPE_STR,
'location' => TYPE_STR,
'company' => TYPE_STR,
'businessType' => TYPE_STR,
'advertisingBudget' => TYPE_STR,
'comments' => TYPE_STR,
'region' => TYPE_ARRAY,
));


$error_message = "<ul class='wsul'>";
if (empty($to)) {
$error_message .= '<li class="wserror">Contact us email not set yet please contact Adminstrator.</li>';
}
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
if (!preg_match($email_exp, $vbulletin->GPC['email'])) {
$error_message .= '<li class="wserror">The Email Address you entered does not appear to be valid.</li>';
}
$string_exp = "/^[A-Za-z .'-]+$/";
if (!preg_match($string_exp, $vbulletin->GPC['first_name'])) {
$error_message .= '<li class="wserror">The First Name you entered does not appear to be valid.</li>';
}
if (!preg_match($string_exp, $vbulletin->GPC['last_name'])) {
$error_message .= '<li class="wserror">The Last Name you entered does not appear to be valid.</li>';
}
if (strlen($vbulletin->GPC['comments']) < 2) {
$error_message .= '<li class="wserror">The Comments you entered do not appear to be valid.</li>';
}


if ((!is_numeric($vbulletin->GPC['internationalCode']) or ! is_numeric($vbulletin->GPC['phone']))) {
$error_message .= '<li class="wserror">The Phone you entered do not appear to be valid.</li>';
} else {
if (strlen($vbulletin->GPC['internationalCode']) < 1 or strlen($vbulletin->GPC['internationalCode']) > 4) {
$error_message .= '<li class="wserror">The Phone code you entered should be max length 4 and min length 1.</li>';
}
}
if (!$vbulletin->GPC['location']) {
$error_message .= '<li class="wserror">The location you entered do not appear to be valid.</li>';
}
if (empty($vbulletin->GPC['company'])) {
$error_message .= '<li class="wserror">The company you entered do not appear to be valid.</li>';
}
if (!$vbulletin->GPC['region']) {
$error_message .= '<li class="wserror">Select at least one Regions of interest.</li>';
}
if (!$vbulletin->GPC['advertisingBudget']) {
$error_message .= '<li class="wserror">The advertisingBudget you entered do not appear to be valid.</li>';
}
if (!$vbulletin->GPC['businessType']) {
$error_message .= '<li class="wserror">The businessType you entered do not appear to be valid.</li>';
}

$error_message .= "</ul>";

if (strlen($error_message) > 22) {
$haserror = 1;
} else {


$firstName = $vbulletin->GPC['first_name'];
$lastName = $vbulletin->GPC['last_name'];
$comments = $vbulletin->GPC['comments'];
$phoneNo = $vbulletin->GPC['internationalCode'] . '-' . $vbulletin->GPC['phone'];
$location = $vbulletin->GPC['location'];
$company = $vbulletin->GPC['company'];
$businessType = $vbulletin->GPC['businessType'];
$advertisement = $vbulletin->GPC['advertisingBudget'];
$email = $vbulletin->GPC['email'];
foreach ($vbulletin->GPC['region'] as $key => $region) {
$regions.=$region . ' ,';
}
$regions = trim($regions, ',');
$headers = 'From: ' . $email . '' . "\r\n" .
'Reply-To: ' . $to . '' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
eval(fetch_email_phrases('ws_contactform'));
@mail($to, $subject, $message, $headers);
//vbmail($to, $subject, $message);
$thanks = 1;
}

$navbits = array();
$navbits[''] = 'Contact Form';
$navbits = construct_navbits($navbits);
$navbar = render_navbar_template($navbits);
$templater = vB_Template::create('ws_contact_forum');
$templater->register_page_templates();
$templater->register('navbar', $navbar);
$templater->register('error_message', $error_message);
$templater->register('haserror', $haserror);
$templater->register('thanks', $thanks);


print_output($templater->render());
} else {

$url = $vbulletin->options['bburl'];
header("Location:$url");
}
// ### ALL DONE! SPIT OUT THE HTML AND LET'S GET OUTTA HERE... ###


/*================================================= =====================*\
|| ################################################## ##################
|| # Downloaded: 04:27, Mon Oct 20th 2014
|| # CVS: $RCSfile$ - $Revision: 29446 $
|| ################################################## ##################
\*================================================ ======================*/



Edit:
I just realised I posted this is the wrong section. Sorry about that.
vB4 Programming Discussions (https://vborg.vbsupport.ru/forumdisplay.php?f=252) - The moderators can move this thread over there if they want.
Edit 2:
Thanks for moving it.

[Dave]

It's a contact form.

[Dragonsys]

odd that the THIS_SCRIPT is index though, but yes, as Dave mentioned that is a contact form.

[Paul M]

You would think this gives it away really ;

$navbits[''] = 'Contact Form';
$navbits = construct_navbits($navbits);
$navbar = render_navbar_template($navbits);
$templater = vB_Template::create('ws_contact_forum');

[akz645]

You would think this gives it away really ;

$navbits[''] = 'Contact Form';
$navbits = construct_navbits($navbits);
$navbar = render_navbar_template($navbits);
$templater = vB_Template::create('ws_contact_forum');

Well I got that much. I probably should have explained the context.

It was a file php file named "ws_send_email", which was inside a mod somebody created.

Hence I was suspicious whether or not there was any malicious code in it.
That's why I'm asking, since I don't understand why it's needed for the modification to work.

If the purpose was malicious, this is what I was thinking:
All the details I have stored in the 'contact us' section will be sent to the coder. Also, if anybody else uses that part in my forum, their details will be sent to the coder too.

[In Omnibus]

If I recall that is part of a mod by Wolfshead Solutions. Mosh Shigdar has been effectively retired for quite some time but he was among the finest coders vBulletin had and certainly not malicious by any reasonable measure.

[Paul M]

I have not seen Mosh around for ages (last logged on the site in 2013).
He wrote quite a few add-ons to my mods for Flashchat, and borrowed (with permission) some other bits of my code.

Not sure which of his mods that would be part of, but nothing of his would be malicious.