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書名： WordPress 3 Plugin Development Essentials
作者名： Brian Bondari Everett Griffiths
本章字數： 237字
更新時間： 2021-04-09 21:19:57

Deconstructing an existing plugin: "Hello Dolly"

WordPress ships with a simple plugin named "Hello Dolly". Its name is a whimsical take on the programmer's obligatory "Hello, World!", and it is trotted out only for pedantic explanations like the one that follows (unless, of course, you really do want random lyrics by Jerry Herman to grace your administration screens).

Activating the plugin

Let's activate this plugin so we can have a look at what it does:

Browse to your WordPress Dashboard at http://yoursite.com/wp-admin/.
Navigate to the Plugins section.
Under the Hello Dolly title, click on the Activate link.

You should now see a random lyric appear in the top-right portion of the Dashboard. Refresh the page a few times to get the full effect.

Examining the hello.php file

Now that we've tried out the "Hello Dolly" plugin, let's have a closer look. In your favorite text editor, open up the /wp-content/plugins/hello.php file. Can you identify the following integral parts?

The Information Header which describes details about the plugin (author and description). This is contained in a large PHP /* comment */.
User-defined functions, such as the hello_dolly() function.
The add_action() and/or add_filter() functions, which hook a WordPress event to a user-defined function.

It looks pretty simple, right? That's all you need for a plugin:

An information header
Some user-defined functions
add_action() and/or add_filter() functions

Now that we've identified the critical component parts, let's examine them in more detail.

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WordPress 3 Plugin Development Essentials

Deconstructing an existing plugin: "Hello Dolly"

Activating the plugin

Examining the hello.php file