Today I want to go over some of the do’s and don’ts of WordPress theming. Regardless if you’re building a WordPress theme for yourself or if you’re building one for release so others can use it, you should be following these do’s and don’ts as closely as possible.

1. Do not hard code full URL’s into your themes

When you’re building your themes, there may be times where images are used, for social media icons or RSS feed icons, and during these points in your coding, you may want to code the full url out (ie: /wp-content/themes/your-theme-name/images/image.jpg) but this will cause errors in the website whenever the person using your theme changes their theme folder name.

The proper codes to use in order to pull the full URL’s dynamically are below.

/images/image.jpg

2. Do utilize the template tags as much as possible

WordPress does an awesome job of laying out all of the template tags you can use, so do yourself a favor (as well as the rest of the people who may use your themes) and learn the WordPress template tags – then utilize them as much as possible. By using template tags, you’re able to ensure that your themes don’t break or cause errors when the end user sets it up and gets it running.

3. Do not forget navigation drop down codes

When you’re building your WordPress theme, one item that seems to be overlooked is the drop down codes for your navigation. Sure, some themes might have the navigation set up to not utilize the multi level ul’s, keeping everything in one single row, but what about for those of us who have multiple child pages for each main parent page?

There’s a solution for that. You can check out some of the tutorials below on how to code multi-level drop down menus.

• How to implement a perfect multi-level navigation bar
• Multi-level drop down navigation menus: Examples and tutorials
• Multi-level menus with jquery and css

4. Do make your theme widget ready

In my opinion, as an end user, there’s nothing worse than deploying a theme and getting ready to set everything up, only to notice that I am now faced with the task of trying to customize sections of my themes by hard coding information into them. Your sidebars and various other places in your theme (do you have a three column footer? widgetize it!) should be as easy to edit as possible. It’s one of the easiest things to do to your themes, and will benefit your theme’s users a lot.

Automattic has a great tutorial on how to widgetize your theme. Check it out here.

Also be sure to check out the widgetizing themes tutorial here at Theme Lab.

5. Do not make users rely on numerous plugins for your theme to work

If you’re releasing themes for free or creating commercial WordPress themes, you should take your end users best interest into play with you’re building your themes. Cluttering your themes with 5-10 needed plugins will not only cause people to be frustrated when downloading and setting up your theme on their site, it will also cause a lot of people to not download it at all because, lets face it, people don’t have attention spans of more than 2-3 seconds.

For instance, if you’re going to set up pagination in your theme, why not utilize this article to learn how to set it up in your theme automatically. Cats Who Code has a pretty good tutorial on how to add pagination into your theme without needing to activate a plugin.

6. Do show the search term on the search results page

For some reason, this is an often overlooked tip that you can (and should) implement into your themes. It’s a simple, one line code that allows your theme to remind the visitor what they just searched for. It may seem trivial, but it is helpful so if the results bring back zero posts, the visitor knows the exact phrase they searched for and can then type in a different search term.

Below is the code used to replace your current “Search Results” title in your theme.

Search Results for  

7. Do not half ass your 404 error pages

Instead of just leaving your 404 page to say “404 – page not found”, why not give your visitors some more options? Adding in a category list, recent posts, popular posts, a search box and (if you’d like to monetize your 404 page) an advertisement can give your 404 page some spice compared to the dull, useless ones found in most WordPress themes.

If you’re looking for 404 page inspiration, Smashing Magazine has a killer showcase of 404 pages from around the web that is worth checking out.

8. Do make sure you have all of the basic files in your theme folder

When you’re building a WordPress theme, making sure you can customize it as much as possible right from the get-go is essential. Starting out with an index.php, header.php, sidebar.php and footer.php file combo might seem like a good idea to the minimalists out there, but I’d suggest starting out with all of the basics below in order to give you a bit more control over what is displayed – when, where and how.

• style.css
• header.php
• index.php
• sidebar.php
• footer.php
• single.php
• page.php
• comments.php
• 404.php
• functions.php
• archive.php
• searchform.php
• search.php

For more information about these template files and what they do, check out the template hierarchy page on WordPress.org.

9. Do not forget the RSS integration

When you’re building your blog, one of the items that draw peoples attention the most is the ability to subscribe to your blog via an RSS reader. So, instead of requiring your theme users to add this information in themselves, why not take the steps to add in a subscribe to rss box just like you do the search box. Add a RSS button, a subscribe via email option and you can also even add in the subscriber count in text by adding this bit of code to your theme where you’d like it to be displayed (replace “feedburner-id” with your own FeedBurner ID – if you’re releasing this theme in the wild, take a look at #11 on our list and make sure you have this as an option).

feed->entry['circulation'];
    echo $fb;
    //end get cool feedburner count
    ?>

10. Do add CSS styles for threaded comments

If you’re building a theme, you should always be prepared for threaded comments. It’s a feature in WordPress that a lot of blogs use in order to build interaction in their comments section. So, preparing your stylesheet for threaded comments is a great idea. Chris has a great post on CSS codes for the default CSS classes that WordPress spits out in their comments section, giving your theme a stylized comments section without needing to touch the comments.php file.

11. Do not release a theme without an options panel

Some people might not agree with this, but I believe it’s a part of the natural progression of WordPress theming. If your theme isn’t running some kind of WordPress options panel with the ability to edit, customize and change items in your theme without having to edit codes, you’re doing something wrong.

If you’re not sure how to go about creating your own theme options panel, the links below will show you how to do it.

• Create custom option panels with WordPress 2.9
• How to create a better WordPress options panel

12. Do make sure your themes work out of the box

This goes hand in hand with #5 on out list – you should always make sure your themes work right out of the box. Some themes I’ve seen require 5-6 steps before the theme is workable on the site, including, but not limited to, plugin activation and theme option panel editing/saving. If the theme requires certain things, make sure there’s a backup default item used.

For instance, in your theme options panel you’re building and/or using, make sure there’s default information in each section, so things are showing up, regardless if the end user has updated them or not. The same goes with plugins, if you’re using a WordPress pagination plugin in your theme, why not code it in so that the theme reverts back to the previous/next links if the plugin isn’t active.

13. Do not make excessive use of custom fields

Yes, most magazine style WordPress themes from a couple years ago were built utilizing custom fields at every turn, but most people will not want to actually fill out 3, 4 or 5 custom fields for each post. So, make things easier for them. If you’re going to show an image from the post on the home page of your theme, take this handy piece of code and add it into your themes functions.php file and it will automatically the posts first image, without the need of a custom field.

// Get URL of first image in a post
function catch_that_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();
$output = preg_match_all('//i', $post->post_content, $matches);
$first_img = $matches [1] [0];

// no image found display default image instead
if(empty($first_img)){
$first_img = "/images/default.jpg";
}
return $first_img;
}

Once you’ve added that code in, just add in your theme’s files wherever you’d like the image to show up.

Thanks to the good ol’ WordPress support forums for this handy tip.

14. Do SEO your