dolibarr/htdocs/public/test/test_sessionlock.php

<?php
if (!defined('NOREQUIREUSER')) {
	define('NOREQUIREUSER', '1');
}
if (!defined('NOREQUIREDB')) {
	define('NOREQUIREDB', '1');
}
if (!defined('NOREQUIRESOC')) {
	define('NOREQUIRESOC', '1');
}
if (!defined('NOREQUIRETRAN')) {
	define('NOREQUIRETRAN', '1');
}
if (!defined('NOSTYLECHECK')) {
	define('NOSTYLECHECK', '1'); // Do not check style html tag into posted data
}
if (!defined('NOCSRFCHECK')) {
	define('NOCSRFCHECK', '1'); // Do not check anti CSRF attack test
}
if (!defined('NOTOKENRENEWAL')) {
	define('NOTOKENRENEWAL', '1'); // Do not check anti POST attack test
}
if (!defined('NOREQUIREMENU')) {
	define('NOREQUIREMENU', '1'); // If there is no need to load and show top and left menu
}
if (!defined('NOREQUIREHTML')) {
	define('NOREQUIREHTML', '1'); // If we don't need to load the html.form.class.php
}
if (!defined('NOREQUIREAJAX')) {
	define('NOREQUIREAJAX', '1'); // Do not load ajax.lib.php library
}
if (!defined("NOLOGIN")) {
	define("NOLOGIN", '1'); // If this page is public (can be called outside logged session)
}
// If you don't need session management (can't be logged if no session used). You must also set
// NOCSRFCHECK, NOTOKENRENEWAL, NOLOGIN
// Disable module with GETPOST('disablemodules') won't work. Variable 'dol_...' will not be set.
// $_SESSION are then simple vars if sessions are not active.
// TODO We can close session with session_write_close() as soon as we just need read access everywhere in code.
if (!defined("NOSESSION")) {
	define("NOSESSION", '1');
}


// Special
// We add header and output some content before the include of main.inc.php !!
// Because we need to So we can make
header("Content-type: text/html; charset=UTF8");

// Security options
header("X-Content-Type-Options: nosniff"); // With the nosniff option, if the server says the content is text/html, the browser will render it as text/html (note that most browsers now force this option to on)
header("X-Frame-Options: SAMEORIGIN"); // Frames allowed only if on same domain (stop some XSS attacks)


print "Legend:<br>\n";
print 'PHP_SESSION_DISABLED='.PHP_SESSION_DISABLED."<br>\n";
print 'PHP_SESSION_NONE='.PHP_SESSION_NONE."<br>\n";
print 'PHP_SESSION_ACTIVE='.PHP_SESSION_ACTIVE."<br>\n";
print '<br>';

print 'session_status='.session_status().' (before main.inc.php)';
print '<br>';

require '../../main.inc.php';

// Security
if ($dolibarr_main_prod) {
	accessforbidden();
}


/*
 * View
 */

print 'session_status='.session_status().' (after main.inc.php)';
print '<br>';

//print 'a'.$_SESSION['disablemodules'].'b';

print "\n<br>This page is visible. It means you are not locked by another page called in same session.";

//session_write_close();