Amit Gupta

iG:Syntax Hiliter allows you to post source code to your site with syntax highlighting and formatting (as seen in code editors, IDEs). You can paste the code as is from your code editor or IDE and this plugin will take care of all the code colouring and preserve your formatting. It uses the <a href="http://qbnz.com/highlighter/" rel="nofollow ugc">GeSHi library</a> to colourize your code and supports over a 100 programming languages. Most common languages are included with the plugin and it includes drop in support for more languages used by GeSHi.
NOTE : For fast results and less load on your server, you should have a cache plugin installed. That way the plugin won’t have to parse the code blocks on a post every time its loaded in browser.
<h4>Minimum Requirements</h4>
<ul>
<li>WordPress 4.1 or above</li>
<li>PHP 7.4.0 or above</li>
</ul>
Pull requests are welcome on Github.
Github: <a href="https://github.com/coolamit/ig-syntax-hiliter/" rel="nofollow ugc">https://github.com/coolamit/ig-syntax-hiliter/</a> 
<a href="https://github.com/coolamit/ig-syntax-hiliter/blob/master/README.md" rel="nofollow ugc">Documentation on plugin usage and configuration</a>

iG:Syntax Hiliter

A plugin to easily present source code on your site with syntax highlighting and formatting  (as seen in code editors, IDEs).

mattsaul

Wherever you have code you don?t want the visual editor to touch use the [ignore_code] shortcode. 
This version also supports the [insert_php] and <?php tags, though for the PHP tag you will have to 
start the first line with <?php // > With latter two codes you will have to separately install 
plugins to get the dynamic PHP insertion functionality.

Ignore Code

I am using WordPress 6.1. My shortcodes are not ignored within the block editor with this plugin.

Nice idea but does not work

Causes the visual editor to ignore code within the ignore_code shortcode.  Great at keeping advanced HTML, JavaScript, or PHP code intact.

iG:Syntax Hiliter vs Ignore Code