JiveDig

<?php

/**
 * Gets the primary term of a post, by taxonomy.
 * If Yoast Primary Term is used, return it,
 * otherwise fallback to the first term.
 *
 * @version 1.3.0
 *
 * @link https://gist.github.com/JiveDig/5d1518f370b1605ae9c753f564b20b7f

jawinn

<?php 
/**
 * Get the Yoast primary category from its post meta value, and displays it, with HTML markup.
 * If there is no primary category set, it displays the first assigned category.
 * 
 * @param boolean $useCatLink Whether to link the category, if it exists
 * @return void
 */
function yourtheme_display_yoast_primary_category( $useCatLink = true ) {