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I know how to include my own functions by writing them into the theme's functions.php and enqueuing them, or by including a php file containing all that in functions.php.

But that is always bound to the used theme. If I switch to another theme, I always have to copy that code to the new theme's functions.php

Is there any way around that - a place/file where I can define and enqueue scripts that remain valid across all themes? (without loosing it when WP is updated)?

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This is not quite simple (as copying and pasting into new functions.php :D), but you can create a plugin that will load this every time.

A (very) good and simple guide can be found here.

Addition by Original Poster (johannes)

I created a plugin for that:

  1. I created a simple php file and put it into wp-content/plugins. It looks basically like this (i.e. it contains the plugin name, description, author etc. and the function I want to use in my site across all themes):

    <?php
    /**
     * Plugin Name: Function-Includer
     * Plugin URI: my URI
     * Description: my description
     * Version: 1.0
     * Author: johannes
     * Author URI: my URI
     */
    
    [... code of my function ...]
    
    ?>
    
  2. Then I went into the WP admin backend, to the plugin page, where that plugin is listed as "Function-Includer" and activated it.

  3. Done - the function is available everywhere in my site now.

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  • 1
    May you please elaborate on how this guide would help? Commented Sep 21, 2016 at 13:06
  • Wow, this wasn't even all that hard in my case - first I hesitated, but then I managed creating that plugin in a few minutes, and it works :-)
    – Johannes
    Commented Sep 21, 2016 at 13:35
  • 1
    Detailing what you did as an answer or an edit to the accepted answer would improve this Q&A for others. Commented Sep 21, 2016 at 13:39
  • @AndyMacaulay-Brook okay, I just did that
    – Johannes
    Commented Sep 21, 2016 at 13:52
  • do you mind sharing the code? Without complete code I don't see how this answer can help anybody!!
    – Tara
    Commented Sep 21, 2016 at 15:32

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