Please upgrade the plugin version available on https://wordpress.org/plugins/wp-syntax/ to fix it for PHP 8 (that removed create_function)

[michaliskambi]

The version of this plugin currently released on https://wordpress.org/plugins/wp-syntax/ has the geshi.php version that uses create_function, which unfortunately fails with PHP 8 (that removed create_function, https://www.php.net/manual/en/function.create-function.php ).

I found that latest version of geshi.php, 1.0.9.1, from https://github.com/GeSHi/geshi-1.0/blob/master/src/geshi.php , has this issue fixed.

Then I found that actually this repository also already has a fix, https://github.com/shazahm1/WP-Syntax/commit/4fe9a200b14b369a6b43b36f18ca2cb1f1afeb2c :) So, while I would advise to upgrade to GeSHi 1.0.9.1 (to rely on GeSHi code used also by other frameworks, like Drupal), the practical problem is also already fixed here.

But the https://wordpress.org/plugins/wp-syntax/ doesn't contain this fix. Although it says "Last updated:8 months ago" (so after the commit https://github.com/shazahm1/WP-Syntax/commit/4fe9a200b14b369a6b43b36f18ca2cb1f1afeb2c ), but the contents downloaded from https://downloads.wordpress.org/plugin/wp-syntax.1.1.zip contain geshi.php with create_function used. And it indeed fails with PHP 8, e.g. when trying to use this code in Wordpress post:

<pre lang="cpp" line="1">__fastcall void TViewMain::ClickMove(TObject* Sender)
{
    Scene1->Translation = Scene1->Translation + Vector3(0, 1, 0);
}

__fastcall void TViewMain::ClickBunny(TObject* Sender)
{
    Scene1->Url = "castle-data:/Bunny.gltf";
}
</pre>

it will fail with PHP error

PHP Fatal error:  Uncaught Error: Call to undefined function create_function() in ...

Please upgrade version on https://wordpress.org/plugins/wp-syntax/ , as I guess the issue will impact more and more users as they upgrade to PHP 8. Debian stable (bookworm) comes now with PHP 8.2.

[shazahm1]

Fixed in release 1.2.

• Update GeSHi to version 1.0.9.1 at GH commit 7884d22 on Feb 19, 2023.