$doc->Filename UTF-8 characters (v2023)

[philmills]

I'm using the following to generate my export pdf filename:

$doc->FileName = Language()->phrase('StudentsIncidents_9') . "_{$recordId}_{$formattedDateTime}_(" . Language()->phrase('StudentsIncidents_11') . " " . date("d_m_Y @H_i") . ").pdf";

It's working fine except that if there are any non-latin characters in the generated filename they get incorrectly outputted.
e.g the letter ä will be output as ä in thge filename.

How can I get it to generate the filename correctly? Special characters are all correctly rendered throughout the site, it's only export filenames which are a problem

[arbei]

1. Did you mean the exported file downloaded by your browser?
2. Make sure your project charset is "utf-8" and your language files (with the added phrases 'StudentsIncidents_9' and 'StudentsIncidents_11') are correctly encoded in utf-8.

[philmills]

1. yes
2. where is the project charset defined? I can't see such a setting
   the phyical file is encoded UTF-8, those language phrases 'StudentsIncidents_9' and 'StudentsIncidents_11' are both defined in languageLoad () function

v2023

[arbei]

1. Project Charset,
2. You better do die($doc->FileName) or Log($doc->FileName) to check if your file name are built in utf-8 correctly by your expression.

[philmills]

1. project charset is UTF-8
2. I used die($doc->FileName) - filename is not built correctly