PT-BR: Trocar o output do Breadcrumb do plugin Yoast para uma versão com microdata. | EN: Change output of your Yoast breadcrumbs to version with microdata

functions.php

<?php 

/*
 * Plugin Name: Fix Microdata Yoast Breadcrumb
 * Plugin URI: https://gist.github.com/lukasfarina/83cdb2e8c2661b2b8017/
 * Author: Lucas Farina
 * Author URI: lucasfarina.com.br
 * */

// Change Wrap of Breadcrumb
function filter_wpseo_breadcrumb_output ($output) {

    $html = '<ol itemscope="" itemtype="http://schema.org/BreadcrumbList">';

    // New DOMObject
    $dom = new DOMDocument('1.0', 'UTF-8');

    /// Load HTML
    $dom->loadHTML(mb_convert_encoding($output, 'HTML-ENTITIES', 'UTF-8'));

    // Disable Errors
    libxml_use_internal_errors(true);

    $childCount = 0;

    // Get list of <a> childs
    if($dom->getElementsByTagName('a')->length) {

        foreach($dom->getElementsByTagName('a') as $a){

            $html .= "
            <li itemprop=\"itemListElement\" itemscope itemtype=\"http://schema.org/ListItem\">
                <a itemprop=\"item\" href='{$a->getAttribute('href')}'>
                    <span itemprop=\"name\">
                        {$a->nodeValue}
                    </span>
                    <meta itemprop=\"position\" content=\"{$childCount}\" />
                </a>
            </li>";

            $childCount++;
        }

    }

    // Instance finder.
    $finder = new DomXPath($dom);
    $classname  = 'breadcrumb_last';

    // Search by breadcrumb_last <span>
    if($span = $finder->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' $classname ')]")->item(0)) {

        $html .= "
            <li itemprop=\"itemListElement\" itemscope itemtype=\"http://schema.org/ListItem\">
                <strong itemprop=\"item\">
                    <span itemprop=\"name\">
                        {$span->nodeValue}
                    </span>
                    <meta itemprop=\"position\" content=\"{$childCount}\" />
                </strong>
            </li>";

    }

    // Clear Errors
    libxml_clear_errors();

    $html .= '</ol>';

    return $html;

}

// add the filter 
add_filter('wpseo_breadcrumb_output', 'filter_wpseo_breadcrumb_output', 10, 1);