As a sort of newbie developer with php/Joomla, I created a content plugin for Joomla 3 which pretty much did what I wanted and expected...

I then decided to migrate it to Joomla 4 following the very few examples that I could google here and there and nothing works. In fact, the plugin doesn't even seem to load.

So, I decided to get back to a very simple sort of helloworld type thing test and even this test doesn't do anything. I should add that install and activation work and no error message is ever displayed when setting to Maximum.

Here's the very simple thing I tried:

defined('_JEXEC') or die; 
use Joomla\CMS\Plugin\CMSPlugin; 
class PlgContentTest extends CMSPlugin 
    public function onContentPrepare($context, &$article, &$params, $page = 0) 
        if ($context !== 'com_content.article') 
            echo 'Wrong!'; 
        echo 'Here!'; 

I cannot figure out what I've done wrong here, except maybe something about file naming?

My xml:

<?xml version="1.0" encoding="utf-8"?>
<extension type="plugin" version="4.0" method="upgrade" group="content">
<creationDate>January 2022</creationDate>
<copyright>Copyright (C) 2022+ . All rights reserved.</copyright>
<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
<filename plugin="Test">Test.php</filename>
<languages folder="administrator/language">
<language tag="en-GB">language/en-GB/en-GB.plg_content_Test.ini</language>
<language tag="en-GB">language/en-GB/en-GB.plg_content_Test.sys.ini</language>
<language tag="fr-FR">language/fr-FR/fr-FR.plg_content_Test.ini</language>
<language tag="fr-FR">language/fr-FR/fr-FR.plg_content_Test.sys.ini</language>
  • Welcome to JSE, Phil. Please take our tour. Commented Mar 4, 2022 at 22:49

1 Answer 1


Why do you use a capital in your filename? It's something you questioned yourself already.

Could you rename the file from Test.php to test.php?

And change

<filename plugin="Test">Test.php</filename>


<filename plugin="test">test.php</filename>

And do the same with language files.

btw: not related to your issue, but two thing to make it a bit easier:

  1. you don't need to add the language in the file name:

can become


and you can make it yourself easier: add


and remove the whole <languages folder="administrator/language"> [..] <languages> part

edit: Could you try changing your xml manifest to:

<?xml version="1.0" encoding="utf-8"?>
<extension version="4.0" type="plugin" group="content" method="upgrade">

        <filename plugin="test">test.php</filename>


and create a /language/en-GB/ in your plugin folder with files:

  • plg_content_test.ini
  • plg_content_test.sys.ini
  • Well, I obviously tried what you recommend but there's absolutely no change whatsoever...Thanks for the other suggestions by the way.
    – Phil91
    Commented Mar 5, 2022 at 13:29
  • I've added an XML manifest file. Could you test if those settings work for you?
    – pe7er
    Commented Mar 5, 2022 at 14:00
  • Hello @pe7er, sorry but I was out for a while. Yes, with this change it now seems to be working. Thanks for helping out on this. Will try to keep it in mind...Cheers. Philippe
    – Phil91
    Commented Mar 14, 2022 at 11:57

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