Where are these params for the error got? I got in web form submission

Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively in Unknown on line 0

where are these params for the error got? I got in web form submission…
reply and this:

Can you please post the script? My gut feeling is that the script might be a very old one that would be well out of date

code is

<?php   .// on top upper html tag
session_start();
$msgErr="";
if (isset($_POST['submit'])) {
include("applyprocessor.php"); 
$appearConfirm=true;
} else {
$appearConfirm=false;
}


      <?php   // below form - show after form submit
if ($appearConfirm) {
	?><div id="webformConfirm" class="CENTERP slogan"><fieldset id="webformConfirmFieldset">
        You have sent us a message (Apply). <br/>