Hello. I have some problem with encoding with first select - see pictures http://prntscr.com/ntukqo    http://prntscr.com/ntuog6
Problem someweare in string
$html .= '<option value="">' . ($name <> '' ? sprintf(__('[b]Select %s ...[/b]', 'attributes'), strtolower($name)) : __('Select value ...', 'attributes')) . '</option>';
Variable %s return wrong encoding. All other function work property with cyrillic.

Database and php has coding UTF-8

Any idea?

@megacheb
Replace
sprintf(__('[b]Select %s ...[/b]', 'attributes'), strtolower($name))
with
__('Select', 'attributes') . ' ' . strtolower($name)
I do not think those attributes are original in plugin and yet never heard about such issue.

Thanks for you reply. Original:  sprintf(__('Select %s ...', 'attributes') without [b][/b]When i use without %s i have lost attribute name in first select.
http://prntscr.com/ntuw9x

Read precisely.

@megacheb
Replace

Code: [Select]

sprintf(__('[b]Select %s ...[/b]', 'attributes'), strtolower($name))
with

Code: [Select]

__('Select', 'attributes') . ' ' . strtolower($name)
I do not think those attributes are original in plugin and yet never heard about such issue.

I found solution:
strtolower() does not work for for cyrillic chars. Proof: https://php.net/manual/en/function.strtolower.php

For cyrillic is necessary use mb_strtolower() or mb_convert_case

You, as a developer must know this and use universal solution, which work with various encoding!

Regards