Updating to PHP 7.3 issues some Warnings

[rieschl]

I just tried to update my site to PHP 7.3 using the latest TCPDF version (6.3.2).
When I try to create a PDF, I get a lot of Warnings (some of them more than once)

Warning: Invalid argument supplied for foreach() in /vendor/tecnickcom/tcpdf/include/tcpdf_fonts.php on line 1842
Warning: array_map(): Expected parameter 2 to be an array, bool given in /vendor/tecnickcom/tcpdf/include/tcpdf_fonts.php on line 2002
Warning: array_map(): Expected parameter 2 to be an array, null given in /vendor/tecnickcom/tcpdf/include/tcpdf_fonts.php on line 1781
Warning: array_merge(): Expected parameter 1 to be an array, null given in /vendor/tecnickcom/tcpdf/include/tcpdf_fonts.php on line 2010
Warning: array_merge(): Expected parameter 2 to be an array, null given in /vendor/tecnickcom/tcpdf/include/tcpdf_fonts.php on line 2010
Warning: count(): Parameter must be an array or an object that implements Countable in /vendor/tecnickcom/tcpdf/tcpdf.php on line 6345
Warning: max(): Array must contain at least one element in /vendor/tecnickcom/tcpdf/tcpdf.php on line 6341

Is this something I am doing wrong or are there still some issues with PHP 7.3?
All errors occur when I call the method $tcpdf->GetStringWidth().

Also I noticed, when using a non-default font, TCPDF deletes all images that have been used in $tcpdf->Image().
I had this line in the PDF: $pdf->SetFont('freesans', '', 8);. After removing it, the images were not deleted anymore.

Thank you for your help!

[nicolaasuni]

would you please check again with the latest version?

[rieschl]

Just updated to 6.3.3 but they are still there :(
It's the same behavior, the warnings come from calling $tcpdf->GetStringWidth().

The image deletion problem is also still present, same as before, when using a custom font-family.

Edit: I just noticed that the image deletion now happens always, and not just with custom font-family, so it's worse than before :/

[nicolaasuni]

I have just pushed the 6.3.4 version that should solve the image issue.
I can accept a PR for the warnings but I am not actively working this as I would like to concentrate on tc-lib-pdf instead.

[rieschl]

Thanks! I removed the GetStringWidth calls for now. Maybe I'll look into it some time.

[arwinvdv]

I had the same error Warning: array_map(): Expected parameter 2 to be an array, bool given in with upgrading to PHP v7.4.
TCPDF version 6.3.5.
I replaced $tcpdf->GetStringWidth(utf8_decode('textWithSpeçïálCharacters')) to $tcpdf->GetStringWidth('textWithSpeçïálCharacters') and now it works.