- WordPress 3 Plugin Development Essentials
- Brian Bondari Everett Griffiths
- 269字
- 2021-04-09 21:19:58
Understanding the Includes
When you activate a plugin, the name of the file containing the information header is stored in the WordPress database. Each time a page is requested, WordPress goes through a laundry list of PHP files it needs to load, so activating a plugin ensures that your own files are on that list. To help illustrate this concept, let's break WordPress again.
Exercise – parse errors
Try the following exercise:
- Ensure that the "Hello Dolly" plugin is active.
- Open the
/wp-content/plugins/hello.phpfile in your text editor. - Immediately before the line that contains function hello_dolly_get_lyric, type in some gibberish text, such as "asdfasdf" and save the file.
- Reload the plugins page in your browser.
- This should generate a parse error, something like:
Parse error: syntax error, unexpected T_FUNCTION in /path/to/wordpress/html/wp-content/plugins/hello.php on line 16
Yikes! Your site is now broken. Why did this happen? We introduced errors into the plugin's main file (hello.php), so including it caused PHP and WordPress to choke. If you did not see any errors and instead saw only a blank white page, you need to refer back to the previous chapter and the section on debugging to ensure that you have configured PHP to report errors. This is vital!
Delete the gibberish line from the hello.php file and save to return the plugin back to normal.
The parse error only occurs if there is an error in an active plugin. Deactivated plugins are not included by WordPress and therefore their code is not parsed. You can try the same exercise after deactivating the plugin and you'll notice that WordPress does not raise any errors.
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