Function at a theme for wordpress, Helping to edit something - php

Question

I have been installing a Wordpress Theme, the theme has a custom navigation function.
It shows a page navigation at archive, categories but doesn't show at tag.
This is the function from functions.php
<?php function wp_pagenavi($before = '', $after = '', $prelabel = '', $nxtlabel = '', $pages_to_show = 5, $always_show = false) {
global $request, $posts_per_page, $wpdb, $paged;
if(empty($prelabel)) { $prelabel = '<strong>«</strong>';
} if(empty($nxtlabel)) {
$nxtlabel = '<strong>»</strong>';
} $half_pages_to_show = round($pages_to_show/2);
if (!is_single()) {
if(!is_category()) {
preg_match('#FROM\s(.*)\sORDER BY#siU', $request, $matches); } else {
preg_match('#FROM\s(.*)\sGROUP BY#siU', $request, $matches); }
$fromwhere = $matches[1];
$numposts = $wpdb->get_var("SELECT COUNT(DISTINCT ID) FROM $fromwhere");
$max_page = ceil($numposts /$posts_per_page);
if(empty($paged)) {
$paged = 1;
}
if($max_page > 1 || $always_show) {
echo "$before <div class='Nav'><span>Pages ($max_page): </span>"; if ($paged >= ($pages_to_show-1)) {
echo '« First ... '; }
previous_posts_link($prelabel);
for($i = $paged - $half_pages_to_show; $i <= $paged + $half_pages_to_show; $i++) { if ($i >= 1 && $i <= $max_page) { if($i == $paged) {
echo "<strong class='on'>$i</strong>";
} else {
echo ' '.$i.' '; }
}
}
next_posts_link($nxtlabel, $max_page);
if (($paged+$half_pages_to_show) < ($max_page)) {
echo ' ... Last »'; }
echo "</div> $after";
}
}
}
?>
I hope anyone helping with that function to show page navigation at tag, thanks.

Answer 1

It's doing the wrong match. Change if(!is_category()) into if(!is_category()&&!is_tag())