Thanks for following up!

Hi, I solved this problem myself. My site: dvn-art.ru

Instead of -> $first_letter =mb_strtoupper(mb_substr($tag->name, 0, 1, 'UTF-8'), 'UTF-8');

May come in handy for future updates. Have a nice day.

Now my file t-tags.php is

<?php
/*
Template Name: Tag Index
*/
setlocale(LC_ALL, 'ru_RU.utf-8');
	$list = '';
	$tags = get_terms( 'post_tag' );
	$groups = array();
	if( $tags && is_array( $tags ) ) {
		foreach( $tags as $tag ) {
			$first_letter =mb_strtoupper(mb_substr($tag->name, 0, 1, 'UTF-8'), 'UTF-8');
			$groups[ $first_letter ][] = $tag;
		}
		if( !empty( $groups ) ) {
			foreach( $groups as $letter => $tags ) {
				$list .= "\n\t" . '<h2>' . apply_filters( 'the_title', $letter ) . '</h2>';
				$list .= "\n\t" . '
<ul>';
				foreach( $tags as $tag ) {
					$url = esc_attr( get_tag_link( $tag->term_id ) );
					$count = intval( $tag->count );
					$name = apply_filters( 'the_title', $tag->name );
					$list .= "\n\t\t" . '
<li><a href="' . $url . '">' . $name . '<span>' . $count . '</span></a></li>
';
					}
				$list .= "\n\t" . '';
				$list .= "\n\t" . '</ul>
';
			}
		}
	}else $list .= "\n\t" . '<p>'.__('Sorry, but no tags were found','the-novelist').'</p>';

get_header();?>

	<div id="main">
		<h2 class="entrytitle"><?php the_title();?></h2>
		<div class="entry" id="tagList">
			<?php print $list; ?>
		</div>
	</div><!-- end main -->

<?php get_footer();?>

Hi there,

Can you provide a link to your site so I can check this out? It will help me troubleshoot the issue you're having.

Best,

Christopher

locale set as utf-8, but the function strtoupper in t-tags.php file does not work

Hi, thanks for the excellent work. I have a small problem with displaying Cyrillic tags on index paige (problems with encoding). H2 title letters look like �. Tell me please, how to solve this problem.