Function for wordpress schema.org

functions.php

<?php
function html_tag_schema() {
    $schema = 'http://schema.org/';

    // Is single post
    if(is_single()) {
        $type = "Article";
    }

    // Is author page
    elseif( is_author() ) {
        $type = 'ProfilePage';
    }
    
    // Is search results page
    elseif( is_search() ) {
        $type = 'SearchResultsPage';
    }

    else {
        $type = 'WebPage';
    }

    echo 'itemscope="itemscope" itemtype="' . $schema . $type . '"';
}
?>