Install a snippet

Every snippet page lists a Type and a Status. The type decides where the file goes; the status decides whether you should trust it.

Type	Where it goes	Notes
mu-plugin	wp-content/mu-plugins/	Always loaded, cannot be deactivated from the admin. Create the folder if it does not exist.
plugin	wp-content/plugins/<snippet-name>/	Give it its own folder and keep the file name as published.
snippet	WP Codebox, Code Snippets, or any snippet manager	Paste the file contents without the opening <?php.
script	Wherever you include it from	A plain PHP file, not a WordPress entry point on its own.

Steps

1. Open the snippet page and use the Source link to download the .php file.
2. Copy the file to the location above for its type.
3. Check the header for site-specific values you must change, such as Author URI or a log path.
4. Read the Status row: Complete means the snippet was verified on a live site, WIP and Unknown mean try it on staging first.

Removing a snippet

Delete the file. Every snippet gates itself with the usual defined( 'ABSPATH' ) or die() guard, so nothing else is left behind. Snippets that write log files can leave those behind in the uploads directory or the mu-plugins directory - delete them too.