Using file or sql-lile session storage you got the warning if try to set empty session id.
Try this code
<?php
ini_set('error_reporting', E_ALL);
session_start();
echo 'before id=' . session_id() . PHP_EOL;
session_id("");
echo 'after id=' . session_id() . PHP_EOL;The result is 'Warning: Unknown: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in Unknown on line 0'
So at least you have a chance to locate problem in code and fix it. Using redis session you haven`t got this warning.
But the most important is the next thing.
<?php
ini_set('error_reporting', E_ALL);
echo 'before id=' . session_id() . PHP_EOL;
var_export(session_id(""));
session_start();
echo 'after id=' . session_id() . PHP_EOL;Using original php handler you got something like this:
before id=
''
Warning: session_start(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in /path_to_sample/file.php on line 8
Call Stack:
0.0005 327912 1. {main}() /path_to_sample/file.php:0
0.0006 328032 2. session_start() /path_to_sample/file.php:8
after id=o37rffe3fn3vuuq4vmkcpe0686but with redis session you got the empty session which would be set to client!!!
Using file or sql-lile session storage you got the warning if try to set empty session id.
Try this code
The result is 'Warning: Unknown: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in Unknown on line 0'
So at least you have a chance to locate problem in code and fix it. Using redis session you haven`t got this warning.
But the most important is the next thing.
Using original php handler you got something like this:
but with redis session you got the empty session which would be set to client!!!