<?php
$posttags = get_the_tags();
$count=0;
if ($posttags) {
foreach($posttags as $tag) {
$count++;
echo '<a href="'.get_tag_link($tag->term_id).'">'.$tag->name.'</a> ';
if( $count >4 ) break;
}
}
?>

dene bakalım bunu max 4 etiket.