In there Custom Coding have many times that you want to tweak plug-in, add a code snippet, or change some styling for your WordPress site. However, many users make these changes in a way that’s not viable for the long-term. For example, these changes shouldn’t be put into your parent WordPress theme, as they’ll be overridden when you update your theme.
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Add Custom Code to WordPress Sites

Use the Code Snippets Plugin. The Code Snippets plugin is a great way to add custom code to WordPress sites, and is easier than creating your own plugin. …

Use a Custom Plugin. …

Use Your Child Theme Functions.php.

Use the Code Snippets Plug-in

The Code Snippets plug-in is a great way to add custom code to WordPress sites, and is easier than creating your own plug-in. It basically serves the same purpose as your own plug-in, as custom code can be added without using your theme and in an upgrade-safe way.

Use a Custom Plug-in

Using a custom plug-in is a great way to add code snippets, as you can keep these snippets around if you change themes, and can activate or deactivate them as needed. If you feel comfortable adding your own plug-in, I prefer this route to the Code Snippets plug-in, but it’s a bit more difficult to do.

The WordPress Codex has a good resource on writing a plug-in, and we have a tutorial on creating a custom WooCommerce plugin that you can start with, but they go a bit beyond basic plug-in setup.

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