wordpress-theme-niu/functions.php

<?php

// enable automatic update
add_filter('auto_update_core', '__return_true');
add_filter('auto_update_theme', '__return_true');
add_filter('auto_update_plugin', '__return_true');
add_filter('auto_update_translation', '__return_true');

// load and overrride style of parent theme
add_action('wp_enqueue_scripts', 'niu_theme_enqueue_styles');
function niu_theme_enqueue_styles()
{
    wp_enqueue_style('parent-style', get_template_directory_uri().'/style.css');
    wp_enqueue_style('child-style', get_stylesheet_directory_uri().'/style.css', ['parent-style']);
}

// enable archive page.
add_filter('register_post_type_args', 'niu_post_has_archive', 10, 2);
function niu_post_has_archive($args, $post_type)
{
    if ('post' == $post_type) {
        $args['rewrite'] = true;
        $args['has_archive'] = 'news';
    }

    return $args;
}

// add google analytics
add_action('wp_head', 'niu_add_google_analytics');
function niu_add_google_analytics()
{
    echo <<<EOF

<!-- Google Tag Manager -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-K6BD5N9');</script>
<!-- End Google Tag Manager -->

EOF;
}

// disable oembed if url is not my site url
add_filter('oembed_request_post_id', 'niu_check_oembed_url', 10, 2);
function niu_check_oembed_url($post_id, $url)
{
    if (!preg_match('/^'.preg_quote(get_site_url(), '/').'/', $url)) {
        return 0;
    }

    return $post_id;
}