The Lab Code Snippets to Improve WordPress ‘CMS’ on Your Website

Level up your Wordpress CMS

Some handy code snippets for your functions.php

Code Snippets to Improve WordPress ‘CMS’ on Your Website

We’ve been making WordPress websites for a long time, and along we way we have picked up some handy tricks that can help streamline your WordPress CMS and get rid of some of the junk you don’t need.


Fix SSL on Attachment URLs

Source: StackExchange

function fix_attachment_url( $url ) {
if (is_ssl()){
$url = str_replace( 'http://', 'https://', $url );
return $url;
add_filter('wp_get_attachment_url', 'fix_attachment_url');


Disable Pingbacks

Source: Sucuri

add_filter('xmlrpc_methods', function($methods) {
return $methods;


Custom Maintenance Mode

function maintenance_redirect(){
if($_SERVER["REMOTE_ADDR"] != 'ipaddress'){
wp_redirect(site_url('maintenance.html'), 302);
add_action('init', 'maintenance_redirect');


Hidden Content via Shortcode

function visitor_check_shortcode($atts, $content = null) {
if ((!is_user_logged_in() && !is_null($content)) || is_feed()){
return $content;
return '';
add_shortcode('visitor', 'visitor_check_shortcode');


Search Posts Only

function post_only_search($query) {
if ($query->is_search) {
$query->set('post_type', 'post');
return $query;
add_filter('pre_get_posts', 'post_only_search');


Adjust JPEG Quality

Source: Graph Paper Press

function custom_jpeg_quality($arg) {
return (int)100; // change 100 to whatever you prefer, but don't go below 6
add_filter('jpeg_quality', 'custom_jpeg_quality');


Add Excerpt to Pages

if (function_exists('add_post_type_support')) {
add_action('init', 'add_page_excerpts');
function add_page_excerpts(){
add_post_type_support('page', 'excerpt' );


Custom Admin Footer

function custom_admin_footer() {
echo 'By <a href="" title="Web Design & Development by Thrive Digital">Thrive Digital</a>';
add_filter('admin_footer_text', 'custom_admin_footer');


Custom Login Logo

function custom_login_logo() {
echo 'h1 a {background-image:url('.get_bloginfo('template_directory').' !important;}';
add_action('login_head', 'custom_login_logo');

function custom_login_headerurl() {
return home_url('/');
add_filter('login_headerurl', 'custom_login_headerurl');


Hide Themes Menu Item

function remove_theme_menus() {
global $submenu;
add_action('admin_init', 'remove_theme_menus');


Add Custom Admin Favicon

function admin_favicon() {
echo '';
add_action('admin_head', 'admin_favicon');


Remove Unwanted Menu Items

function remove_menu_items() {
remove_menu_page('tools.php'); // Tools
remove_menu_page('edit-comments.php'); // Comments
remove_menu_page('edit.php'); // Posts
add_action('admin_menu', 'remove_menu_items', 100);


Remove Admin Bar

function hide_admin_bar() {
return 0;
add_filter('show_admin_bar', 'hide_admin_bar');


Limit Max Upload Size

Source: StackExchange

add_filter('wp_handle_upload_prefilter', function($file) {
$size = $file['size'];
if ($size > 500 * 1024) {
$file['error'] = '"Files larger than X bytes are prevented from uploads.';
return $file;


Set Default Colour Scheme

function set_user_colour_scheme($color_scheme) {
$color_scheme = 'modern';
return $color_scheme;
add_filter('get_user_option_admin_color', 'set_user_colour_scheme', 5);


Add SVG Support

function add_svg_support($mimes){
$mimes['svg'] = 'image/svg+xml';
return $mimes;
add_filter('upload_mimes', 'add_svg_support');


Did you find any of these snippets useful or have some tips of your own? We would love to hear from you!

Written by Samantha

Samantha is our resident web designer and front-end developer wizard. She is knowledgable in all things digital design and loves to bring new and fresh ideas to our company.