Description:
------------
---
From manual page: https://php.net/function.session-start
---
I read many comments about why a session_start() does not connect.
Luckily one of my 8 lines test program did work.  The difference was the non-working php file was saved as "UTF-8 with BOM" that made every thing else work but session_start().

Note that on the local PortableApps xampp with php 8.0.3 under Windows 10 session_start() connects correctly.  On host www.1and1.com with php 7.4 and 8.05 this problem shows.

Frankly I did not know that UTF-8 had a BOM option till now!!  Unicode https://www.unicode.org/faq/utf_bom.html claims it doesn't, Windows 10 does it anyway.


Test script:
---------------
Setup php file:
<?php
session_start(); 
$_SESSION['keyword'] = 1916; 
$_SESSION['driverVer'] = "1.1.1";
$CrLf = "\r\n";
echo "<br>PHP version is " . phpversion() . $CrLf;
exit;
?>

Run file showing the error:
<?php
session_start(); 
$q = $_SESSION['keyword']; 
$v = $_SESSION['driverVer'];
$CrLf = "\r\n";
echo "<br>-- $q -- $v -- , PHP version is " . phpversion() . $CrLf;
exit;
?>


Expected result:
----------------
If the second file is saved as "UTF-8 with BOM"; then on some systems it will generate an error message.  Note that the same file saved as UTF-8 is a few bytes smaller, but both will pass the compare text test.