Additional PHP 8 deprecation warnings/errors

[gchilders]

On load of prefs.php?subset=project, I'm getting this additional warning with PHP 8.1:

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/boincadm/projects/nfs/html/inc/util_basic.inc on line 126

On load of forum_post.php?id=7, I'm getting

Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /home/boincadm/projects/nfs/html/user/forum_post.php on line 126

Loading of cert1.php fails with

Fatal error: Uncaught ArgumentCountError: time() expects exactly 0 arguments, 1 given in /home/boincadm/projects/nfs/html/user/cert1.php:27 Stack trace: #0 /home/boincadm/projects/nfs/html/user/cert1.php(27): time() #1 {main} thrown in /home/boincadm/projects/nfs/html/user/cert1.php on line 27

Similarly for cert_all.php

Fatal error: Uncaught ArgumentCountError: time() expects exactly 0 arguments, 1 given in /home/boincadm/projects/nfs/html/user/cert_all.php:28 Stack trace: #0 /home/boincadm/projects/nfs/html/user/cert_all.php(28): time() #1 {main} thrown in /home/boincadm/projects/nfs/html/user/cert_all.php on line 28

For cert_all.php, changing time(0) to time() fixes that issues, but then there are many additional warnings such as

Warning: Attempt to read property "total_credit" on string in /home/boincadm/projects/nfs/html/user/cert_all.php on line 48
Warning: Undefined property: stdClass::$total_credit in /home/boincadm/projects/nfs/html/user/cert_all.php on line 48
Warning: Attempt to read property "total_credit" on string in /home/boincadm/projects/nfs/html/user/cert_all.php on line 83

On the backend ops pages, I'm seeing similar warnings in various places:

Deprecated: strstr(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home/boincadm/projects/nfs/html/ops/db_action.php on line 33

Deprecated: strstr(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home/boincadm/projects/nfs/html/inc/db_ops.inc on line 374

Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /home/boincadm/projects/nfs/html/inc/db_ops.inc on line 317

Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /home/boincadm/projects/nfs/html/inc/user.inc on line 461

Deprecated: stripslashes(): Passing null to parameter #1 ($string) of type string is deprecated in /home/boincadm/projects/nfs/html/ops/mass_email.php on line 46

[gchilders]

Also, importantly, login_form.php:

Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /home/boincadm/projects/nfs/html/inc/bootstrap.inc:435 Stack trace: #0 /home/boincadm/projects/nfs/html/inc/bootstrap.inc(435): implode() #1 /home/boincadm/projects/nfs/html/inc/account.inc(160): form_checkboxes() #2 /home/boincadm/projects/nfs/html/user/login_form.php(53): login_form() #3 {main} thrown in /home/boincadm/projects/nfs/html/inc/bootstrap.inc on line 435