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Creating an external file to manage functions separately from the theme

From: Create an Online Portfolio with WordPress

Video: Creating an external file to manage functions separately from the theme

This course revolves around using custom post types and custom taxonomies to create separate buckets for separate types of content. These custom post types and custom taxonomies are defined in the functions.php file in the theme. The functions.php file is where core theme functionality is called or created and custom post types and custom taxonomies are core theme functionalities in WordPress. The problem with using custom post types and custom taxonomies is that since they are defined in the functions file for each theme, if you switch to a different theme, the post types and taxonomies disappear.

Creating an external file to manage functions separately from the theme

This course revolves around using custom post types and custom taxonomies to create separate buckets for separate types of content. These custom post types and custom taxonomies are defined in the functions.php file in the theme. The functions.php file is where core theme functionality is called or created and custom post types and custom taxonomies are core theme functionalities in WordPress. The problem with using custom post types and custom taxonomies is that since they are defined in the functions file for each theme, if you switch to a different theme, the post types and taxonomies disappear.

To avoid this we will create the custom post types and custom taxonomies in a separate file. This file can then be called with an Include function from within the functions.php file in the current theme, and can also be called from any of the other themes, if you're using those instead. I like to call this an obstruction layer. The first step in this process is to create the file where we are going to put all the functions to create the custom post types and custom taxonomies. So we will do that going into themes and then I will create a new file and call it posttypes. Click Finish and you will see it appears inside the themes folder rather than inside one of the actual themes.

Now that I have a file, I am going to put in some dummy content, so that we can see that it works. So I will simply go echo, so that it types out whatever I put in there, and I will say "Hello!", end the line, and end my php delimeter. Now if I save this and go back to my browser and reload the front page, you will see that nothing happens. That's simply because although we made the file, we haven't yet called it into the theme. So that's the next step.

I will go back and into my cooking theme folder. Like I said before, all functions inside WordPress live in a functions.php file inside the theme, so what we need to do now is create that file as well. So I will go to New, create a file, and create a file called functions.php that's saved under the cooking folder. So now we have a functions file that we will append next to the functions file from a parent theme. So we don't need to copy the functions from the parent theme over; all we need to do is add new functions inside here.

What we need to do first is to create a function that calls this posttypes.php file. The great thing about php is there's an actual function that does this for us and it's called include. So if simply say include and I only want it once, I will say include_once, and then we give URL to the file we want to include, it will work. Now theoretically, we should be able to just say ../ and then poststype.php to jump back one folder and then open posttype.php, but that's not going to work.

In this case, we need to hard core the actual URL in. But if I hard core the URL to the file in saying, localhost/ WordPress/da-da-da, it won't work, if we move the child theme somewhere else. So what we need to do is use another function to grab the actual live URL dynamically. That function is called ABSPATH. Next to ABSPATH we need to append the actual URL, so I go space, dot, to append it, and then quotation, and I will say wp- content/themes/and then posttypes.php, end the line with a semicolon, and end the PHP delimeter.

Using this, we should now see that word Hello! appear inside our theme. So I will Save it, go back to my browser, Reload, and you will see Hello! appears here at the very top. That means our child theme now grabs the posttypes.php file living outside the child theme and appends it into the functions. Now just for ease-of-use, I've added this code into my code-snippets file, so you can simply go in here and copy that code out, if you can't remember that exact syntax.

Well, just to reiterate, it's include_ once, ABSPATH, which points to the core sites of where the site is. So it will be www.yoursite.com and then we append the rest of the address here. Although not technically necessary, placing custom post type and custom taxonomies functions in a separate abstraction layer or file makes it easier for you to move the functions to a different or even multiple themes without having to copy and paste or to make changes to the existing functions file.

Furthermore, if you run several themes with the same post types, you can change one file and have these changes permeate throughout all the themes. Simply put, you put all the important stuff in one central location and just call it from there, rather than putting all the important stuff in each individual location.

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This video is part of

Image for Create an Online Portfolio with WordPress
Create an Online Portfolio with WordPress

40 video lessons · 28380 viewers

Morten Rand-Hendriksen
Author

 
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  1. 6m 28s
    1. Welcome
      58s
    2. Using the exercise files
      3m 54s
    3. Using the code snippets file
      1m 36s
  2. 8m 31s
    1. What is an online portfolio?
      2m 43s
    2. Tour of the finished project
      3m 15s
    3. Setting up a WordPress development environment
      2m 33s
  3. 16m 10s
    1. Creating site architecture
      5m 1s
    2. Creating a child theme
      6m 7s
    3. Creating an external file to manage functions separately from the theme
      5m 2s
  4. 25m 26s
    1. What is a custom post type?
      2m 14s
    2. Setting up a custom post type
      6m 39s
    3. Adding advanced variables to the custom post type
      3m 35s
    4. Advanced custom post type functionalities
      4m 29s
    5. Changing the menu position of the custom post type
      3m 19s
    6. Adding a custom post type icon
      5m 10s
  5. 22m 8s
    1. What are custom taxonomies?
      3m 34s
    2. Setting up a basic custom taxonomy
      2m 52s
    3. Hooking a custom taxonomy to a post type
      3m 13s
    4. Adding advanced variables to a custom taxonomy
      3m 9s
    5. Using hierarchical and nonhierarchical custom taxonomies
      5m 54s
    6. Using custom taxonomies in admin
      3m 26s
  6. 25m 40s
    1. Populating content into the custom post types
      10m 54s
    2. Uploading videos to YouTube
      2m 22s
    3. Embedding YouTube videos in a custom post type
      4m 23s
    4. Uploading videos to WordPress
      8m 1s
  7. 39m 47s
    1. Creating custom post type templates
      6m 50s
    2. Adding taxonomy info to the custom post type template
      9m 13s
    3. Creating conditional custom taxonomy links
      4m 46s
    4. Handling multiple post type templates: Individual templates
      6m 25s
    5. Handling multiple post type templates: Consolidating everything in one file
      6m 21s
    6. Handling multiple post type templates: Making custom post types the default
      6m 12s
  8. 15m 23s
    1. Creating an index page for a custom post type
      8m 10s
    2. Creating a custom taxonomy index page
      7m 13s
  9. 12m 3s
    1. Creating a custom footer sidebar template
      6m 58s
    2. Displaying a list of links to the latest custom post type posts
      5m 5s
  10. 14m 58s
    1. Creating static pages for the front and the blog
      4m 54s
    2. Populating the menu with new index pages
      4m 52s
    3. Creating a contact page with a contact form
      5m 12s
  11. 5m 55s
    1. Including the abstraction layer in other stock themes
      5m 55s
  12. 1m 22s
    1. Next steps
      1m 22s

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