function disable_embeds_init() {
    /* @var WP $wp */
    global $wp;
 
    // Remove the embed query var.
    $wp->public_query_vars = array_diff( $wp->public_query_vars, array(
        'embed',
    ) );
 
    // Remove the REST API endpoint.
    remove_action( 'rest_api_init', 'wp_oembed_register_route' );
 
    // Turn off
    add_filter( 'embed_oembed_discover', '__return_false' );
 
    // Don't filter oEmbed results.
    remove_filter( 'oembed_dataparse', 'wp_filter_oembed_result', 10 );
 
    // Remove oEmbed discovery links.
    remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );
 
    // Remove oEmbed-specific JavaScript from the front-end and back-end.
    remove_action( 'wp_head', 'wp_oembed_add_host_js' );
    add_filter( 'tiny_mce_plugins', 'disable_embeds_tiny_mce_plugin' );
 
    // Remove all embeds rewrite rules.
    add_filter( 'rewrite_rules_array', 'disable_embeds_rewrites' );
}
 
add_action( 'init', 'disable_embeds_init', 9999 );
 
/**
 * Removes the 'wpembed' TinyMCE plugin.
 *
 * @since 1.0.0
 *
 * @param array $plugins List of TinyMCE plugins.
 * @return array The modified list.
 */
function disable_embeds_tiny_mce_plugin( $plugins ) {
    return array_diff( $plugins, array( 'wpembed' ) );
}
 
/**
 * Remove all rewrite rules related to embeds.
 *
 * @since 1.2.0
 *
 * @param array $rules WordPress rewrite rules.
 * @return array Rewrite rules without embeds rules.
 */
function disable_embeds_rewrites( $rules ) {
    foreach ( $rules as $rule => $rewrite ) {
        if ( false !== strpos( $rewrite, 'embed=true' ) ) {
            unset( $rules[ $rule ] );
        }
    }
 
    return $rules;
}
 
/**
 * Remove embeds rewrite rules on plugin activation.
 *
 * @since 1.2.0
 */
function disable_embeds_remove_rewrite_rules() {
    add_filter( 'rewrite_rules_array', 'disable_embeds_rewrites' );
    flush_rewrite_rules();
}
 
register_activation_hook( __FILE__, 'disable_embeds_remove_rewrite_rules' );
 
/**
 * Flush rewrite rules on plugin deactivation.
 *
 * @since 1.2.0
 */
function disable_embeds_flush_rewrite_rules() {
    remove_filter( 'rewrite_rules_array', 'disable_embeds_rewrites' );
    flush_rewrite_rules();
}
 
register_deactivation_hook( __FILE__, 'disable_embeds_flush_rewrite_rules' );