Warning: Cannot modify header information - headers already sent by ... in export.files.php . File export Zip, building wrong folder structure

[xusdeejay]

Bug

[export_files.php Warning: preg_match(): Unknown modifier ']' in /homepages/20//htdocs//dolibar/core/lib/files.lib.php on line 2167
Warning: Cannot modify header information - headers already sent by (output started at /homepages/20//htdocs//dolibar/core/lib/files.lib.php:2167) in /homepages/20//htdocs//dolibar/admin/tools/export_files.php on line 172]

Environment

• Version: [Dolibarr 13.0.1]
• OS: [Linux info 3.0 fix : typo #1337 SMP Tue Jan 01 00:00:00 CEST 2000 all GNU/Linux]
• Web server: [Apache]
• PHP: [PHP 7.3.27]
• Database: [MySQL or MariaDB 5.5.60-0+deb7u1]
• URL(s): [https://dolibar/admin/tools/dolibarr_export.php]

Expected and actual behavior

[Warning: preg_match(): Unknown modifier ']' in /homepages/20//htdocs/*/dolibarr/core/lib/files.lib.php on line 2167

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20//htdocs//dolibarr/core/lib/files.lib.php:2167) in /homepages/20//htdocs//dolibarr/admin/tools/export_files.php on line 172*]

Steps to reproduce the behavior

[When exporting step 2 in zip backup.
Proposed solution:
add 'ob_start();' line 75 to wait for the script to finish to send the header but the resulting zip file is wrong;]

[Attached files]

export_files.zip