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WordPress: Creating Custom Widgets and Plugins with PHP

Exploring where plugins reside


From:

WordPress: Creating Custom Widgets and Plugins with PHP

with Drew Falkman

Video: Exploring where plugins reside

The process of installing WordPress plugins is really a pretty straightforward one. Anytime you install a plugin, really all you're doing is copying a folder into a specific directory in the WordPress environment. Sometimes we can download plugins from third-party sites that aren't through the WordPress directory. In the case of CLICKY--although you can get to get through the WordPress site-- they do allow you to download it directly from their web site. So you can see I can click Download the Clicky WordPress Plugin now, which downloaded the plugin.
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  1. 1m 49s
    1. Welcome
      1m 16s
    2. Using the exercise files
      33s
  2. 23m 29s
    1. WordPress overview
      2m 32s
    2. Installing WPI for Windows
      3m 42s
    3. Installing MAMP for the Mac
      3m 25s
    4. Installing and configuring WordPress
      5m 51s
    5. Comparing WordPress 3.0 with previous versions
      2m 57s
    6. Setting up a PHP/WordPress development environment
      5m 2s
  3. 14m 47s
    1. Exploring WordPress plugins
      3m 42s
    2. Administering plugins from the WordPress admin
      5m 23s
    3. Exploring where plugins reside
      2m 51s
    4. Introduction to hooks
      2m 51s
  4. 39m 28s
    1. Creating the plugin PHP file(s)
      3m 12s
    2. More on hooks: Actions and filters
      3m 15s
    3. Installation and activation
      4m 6s
    4. Writing activation code
      3m 45s
    5. Writing an action
      5m 12s
    6. Writing a filter
      4m 15s
    7. About pluggable functions
      2m 1s
    8. Writing a pluggable function
      5m 30s
    9. Using template tags
      2m 46s
    10. Introducing shortcode
      5m 26s
  5. 26m 2s
    1. Widgets and the WordPress Widgets SubPanel
      2m 54s
    2. Comparing widgets and plugins
      1m 8s
    3. Using and customizing built-in widgets
      3m 18s
    4. Creating a new widget
      7m 21s
    5. Writing the constructor and registering widgets
      5m 20s
    6. Enabling configuration of widgets
      6m 1s
  6. 44m 59s
    1. Creating an admin interface
      5m 25s
    2. Saving data to the database
      5m 39s
    3. Securing form submission with nonces
      2m 25s
    4. Options editing post-WordPress 2.7
      4m 8s
    5. Integrating with the WordPress admin menus
      3m 34s
    6. WordPress admin dashboard API
      4m 5s
    7. Using existing options and option editing pages in WordPress
      5m 19s
    8. Using jQuery and AJAX for administration
      14m 24s
  7. 27m 13s
    1. Accessing the WordPress database
      5m 45s
    2. Using the built-in schema
      2m 21s
    3. Accessing data using $wpdb
      5m 15s
    4. Creating new tables
      7m 18s
    5. Inserting data
      6m 34s
  8. 26m 27s
    1. Introducing the Loop
      6m 22s
    2. Using WP_Query()
      3m 11s
    3. Custom filtering and sticky posts
      4m 58s
    4. Using jQuery and AJAX for posts and pages
      11m 56s
  9. 12m 9s
    1. Registering and promoting plugins
      2m 28s
    2. Creating an uninstall function
      5m 53s
    3. Backward compatibility issues
      3m 48s
  10. 15m 3s
    1. Understanding security issues
      11m 20s
    2. Internationalizing your plugin
      3m 43s
  11. 18s
    1. Goodbye
      18s

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WordPress: Creating Custom Widgets and Plugins with PHP
3h 51m Intermediate Nov 04, 2010

Viewers: in countries Watching now:

In WordPress: Creating Custom Widgets and Plugins with PHP, Drew Falkman teaches PHP developers how to create custom functionality for WordPress 2.0 through 3.0 using widgets and plugins. This course starts by installing and setting up WordPress 3.0 on both Mac and Windows, then provides an in-depth look at tasks related to these WordPress add-ons: installing and administering, building and customizing, creating editable options and database tables, working with posts and pages, and utilizing jQuery and AJAX. There are also tutorials dedicated to promoting a widget or plugin, adding security, and localizing the interface. Exercise files are included with the course.

Topics include:
  • Installing WPI and MAMP server solutions
  • Administering WordPress plugins
  • Introducing hooks
  • Writing the PHP for a plugin
  • Using template tags and shortcode
  • Building a new widget
  • Creating an admin interface
  • Accessing the WordPress database
  • Using jQuery and AJAX for posts and pages
  • Registering and promoting plugins
Subjects:
Developer Web CMS
Software:
WordPress
Author:
Drew Falkman

Exploring where plugins reside

The process of installing WordPress plugins is really a pretty straightforward one. Anytime you install a plugin, really all you're doing is copying a folder into a specific directory in the WordPress environment. Sometimes we can download plugins from third-party sites that aren't through the WordPress directory. In the case of CLICKY--although you can get to get through the WordPress site-- they do allow you to download it directly from their web site. So you can see I can click Download the Clicky WordPress Plugin now, which downloaded the plugin.

I can than manually install this from this Plugin screen in the Add New and then clicking on Upload. What this will do is I can upload a ZIP file. It will extract the ZIP file and put it into that directory. So you can see I've got clicky here in my downloads directory. Install Now, and it's installed. And really, basically this is all that's happening with the widgets and the plugins that we are getting from the WordPress directory.

It's just downloading a ZIP file from that web site, extracting it, and uploading it to a specific folder. If we were to take a look inside the development environment--I'm in PDT now-- this is my WordPress installation. There's a number of directories in here. One of them is content and under content, I have plugins. So I had to refresh them there by right- clicking on the Refresh option to see any new ones that existed since the last time I was in this environment.

You can see here is clicky. If I were to open it up, you can see there's a number of different images. There is some language information, so they can work in different environments. There's a readme.txt file, which tells some information about it, and there is a PHP file. This is the actual plugin itself, and we'll get more into how to develop these later. You can also see the other plugins I have. Hello php is the Hello, Dolly. akismet, we talked about earlier.

social-links and tweet-this are also third-party ones that I've downloaded. You can see in some instances they install as directories, or they can install as files. In any case, all plugins in the WordPress environment are simply a php file either on its own or in a directory that's uploaded to the WordPress installation/wp-content/plugins directory. Whether you download them from the WordPress Plugin Directory, or you upload your own ZIP, or you actually manually copy a folder into here, any of those methodologies will work.

Once they're in here, they will become available as a WordPress plugin.

Find answers to the most frequently asked questions about WordPress: Creating Custom Widgets and Plugins with PHP.


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Q: Do I need a web hosting service for this course?
A: You don't need a hosting site to do any testing or development work that’s covered in this course. However, if you want to have your WordPress site available to the public, you will most definitely need a WordPress site. If you are hosting with an independent company, they will need to have PHP and MySQL installed, and there will be some configuration differences, but basically, you can upload anything on your local version to the web site. If you are hosting with Wordpress.com, you will need to add your plugins by uploading them manually through the WP Admin Plugin screen.
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