Eigene Breadcrumb in wordpress

einfach in single.php erstellen:

$postcat = get_the_category( $post->ID );

if ( ! empty( $postcat ) ) {
        print "<div>";
        print "<span><a href=\"/blog/\">Blog</a></span> >> ";
        print "<span><a href=\"/category/".$postcat[0]->slug."/\">".esc_html( $postcat[0]->name )."</a></span> >> ";
        print "<span>".get_the_title( $post_id )."</span> ";
        //slug oder category_nicename
        print "</div>";
 }

bzw so

Erweiterete Version mit CSS

<?php

$postcat = get_the_category( $post->ID );

if ( ! empty( $postcat ) ) {
        print "<style>";
        print "li.bread::after { content: \" / \"; }";
        print "</style>";

        print "<div>";
        print "<ul style=\"list-style-type:none;\">";
        print "<li class=\"bread\" style=\"display: inline-block;white-space: nowrap;\"><a href=\"/blog/\">Blog</a></li>  ";
        print "<li class=\"bread\" style=\"display: inline-block;white-space: nowrap;\"><a href=\"/category/".$postcat[0]->slug."/\">".esc_html( $postcat[0]->name )."</a></li> ";
        print "<li style=\"display: inline-block;white-space: nowrap;\">".get_the_title( $post_id )."</li> ";
        //slug oder category_nicename
        print "</ul>";
        print "</div>";
 }


?>

oder als strukturierte Daten

print "
<script type=\"application/ld+json\">
{
        \"@context\": \"http://schema.org\",
        \"@type\": \"BreadcrumbList\",
        \"itemListElement\": [
        {
                \"@type\": \"ListItem\",
                \"position\": 1,
                \"item\": {
                        \"@id\": \"https://blog.guentherhaslbeck.de/blog/\",
                        \"name\": \"Blog\"
                }
        },{
                \"@type\": \"ListItem\",
                \"position\": 2,
                \"item\": {
                        \"@id\": \"https://blog.guentherhaslbeck.de/category/".$postcat[0]->slug."/\",
                        \"name\": \"".esc_html( $postcat[0]->name )."\"
                }
        },{
                \"@type\": \"ListItem\",
                \"position\": 3,
                \"item\": {
                        \"@id\": \"".get_permalink($post_id)."\",
                        \"name\": \"".get_the_title( $post_id )."\"
                }
        }
        ]
}
</script>
"

Testen unter https://search.google.com/structured-data/testing-tool?hl=de#