This code will help you to customize WP-PageNavi pagination html structure.
Example -1: Using this you can wrap a and span with li
<?php
add_filter( 'wp_pagenavi', 'ap_pagination', 10, 2 );
// customize the PageNavi HTML before it is output
function ap_pagination($html) {
$out = '';
//wrap a's and span's in li's
$out = str_replace("<a","<li><a",$html);
$out = str_replace("</a>","</a></li>",$out);
$out = str_replace("<span","<li><a",$out);
$out = str_replace("</span>","</a></li>",$out);
$out = str_replace("<div class='wp-pagenavi'>","",$out);
$out = str_replace("</div>","",$out);
return '<ul>'.$out.'</ul> ';
}
?>Example 2: Add extra attribute to pagination link
add_filter('wp_pagenavi', 'ap_pagination', 10, 2);
function ap_pagination($html)
{
$out = '';
$out = str_replace("<a", "<a rel='canonical' ", $html);
return $out;
}