kioub

With support for the new block editor in WordPress 5.0!
SyntaxHighlighter Amplified allows you to easily post syntax-highlighted code to your site without losing its formatting or making any manual changes. It uses the <a href="https://github.com/scrivo/highlight.php" rel="nofollow ugc">highlight.php package by Geert Bergman</a> to render code on the server-side so it has no depedencies on extrenal Javascript libraries thus is compatible with AMP pages.
For a live demo, see <a href="https://www.javacodegeeks.com/syntaxhighlighter-amplified/" rel="nofollow ugc">this demo page</a>.
For a list of supported languages (most widely used languages are supported), see the <a href="http://en.support.wordpress.com/code/posting-source-code/" rel="nofollow ugc">WordPress.com support document</a>.
Development of this plugin is <a href="https://github.com/kioub78/syntaxhighlighter-amplified" rel="nofollow ugc">on GitHub</a>. See <a href="https://github.com/kioub78/syntaxhighlighter-amplified/issues" rel="nofollow ugc">list of current issues</a> with the plugin. Please feel free to file any additional issues or requests that you may come across. <a href="https://github.com/kioub78/syntaxhighlighter-amplified/pulls" rel="nofollow ugc">Pull requests</a> are welcome.
Translation of the plugin into different languages is on the <a href="https://translate.wordpress.org/projects/wp-plugins/syntaxhighlighter-amplified" rel="nofollow ugc">translation page</a>.
<h4>CREDITS</h4>
This is a fork of <a href="https://github.com/Automattic/syntaxhighlighter" rel="nofollow ugc">SyntaxHighligher Evolved</a> by <a href="https://alex.blog/" rel="nofollow ugc">Alex Mills</a> (Viper007Bond), which is also <a href="https://wordpress.org/plugins/syntaxhighlighter/" rel="ugc">available on WordPress.org</a>. Copyright (c) 2018 Alex Mills. Licensed under GPL 2.0 or later.
<a href="https://github.com/scrivo/highlight.php" rel="nofollow ugc">highlight.php</a> is released under the BSD 3-Clause License. Copyright © 2006-2013, Ivan Sagalaev (maniac@softwaremaniacs.org), highlight.js (original author). Copyright © 2013, Geert Bergman (geert@scrivo.nl), highlight.php

SyntaxHighlighter Amplified

Easily post syntax-highlighted code to your site without having to modify the code at all. Compatible with AMP pages.

boliquan

WP Code Highlight provides syntax highlighting of source code snippets and it is W3C valid. 
Wrap code blocks with <code><pre></code> and <code></pre></code> 
It provides a code button(HTML editor) to help you insert code in articles easily. 
You don’t need to specify the language since WP Code Highlight will guess, all languages are supported. 
You can put line numbers in your code if you need. 
There are 4 highlight themes, you can choose from them or display by random. 
It can also load <code>wp-code-highlight.css</code> from current wordpress theme directory. 
It can delete its own options, so it is also a green plugin !
<h4>Basic Usage</h4>
<ol>
<li>Download and extract <code>wp-code-highlight.zip</code> to <code>wp-content/plugins/</code></li>
<li>Activate the plugin through the “Plugins” menu in WordPress</li>
<li>“Dashboard”->”Users”->”Your Profile”->”Disable the visual editor when writing”</li>
<li>“Dashboard”->”Settings”->”WP Code Highlight”</li>
<li>Wrap code blocks with <code><pre></code> and <code></pre></code> (It provides a code button in the HTML editor)</li>
<li>You don’t need to specify the language since WP Code Highlight will guess, all languages are supported</li>
<li>It can also load <code>wp-code-highlight.css</code> from current wordpress theme directory</li>
</ol>
<h4>More Information</h4>
For more information of this plugin, please visit: <a href="http://boliquan.com/wp-code-highlight/" title="WP Code Highlight" rel="nofollow ugc">Plugin Homepage</a>.
Related Links:
<ul>
<li><a href="http://boliquan.com/wp-code-highlight/" rel="nofollow ugc">WP Code Highlight (FAQ)</a> | <a href="https://wordpress.org/plugins/wp-code-highlight/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-clean-up/" rel="nofollow ugc">WP Clean Up</a> | <a href="https://wordpress.org/plugins/wp-clean-up/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-smtp/" rel="nofollow ugc">WP SMTP</a> | <a href="https://wordpress.org/plugins/wp-smtp/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-slug-translate/" rel="nofollow ugc">WP Slug Translate</a> | <a href="https://wordpress.org/plugins/wp-slug-translate/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-anti-spam/" rel="nofollow ugc">WP Anti Spam</a> | <a href="https://wordpress.org/plugins/wp-anti-spam/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/yg-share/" rel="nofollow ugc">YG Share</a> | <a href="https://wordpress.org/plugins/yg-share/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">BoLiQuan</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">玻璃泉</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">夜光</a></li>
<li><a href="http://boliquan.com/ylife/" rel="nofollow ugc">YLife</a> | <a href="http://code.google.com/p/ylife/downloads/list" rel="nofollow ugc">Download</a></li>
</ul>

WP Code Highlight

I was using it quite a bit. After a while, I forgot about it. Out of convienience I started to use gist and embedded them. There are good reasons not to do this and for those reasons this plugin is suitable. I do not quite remember, I think I abandoned this plugin, since I use a lot of < and > and there is no fun doing so with the WP Editor. Must have been something like this, but not really related to this plugin.

I switched to PHP7 and my blog posts seem to disappear. I found out, this plugin does not work with PHP7. No worries, your posts are not lost, but they are not displayed properly. When you deactivate the plugin, everything works as it is supposed to.

If you want to use this plugin and PHP7 you might want to have a look into this comment by a friendly user: https://wordpress.org/support/topic/this-plugin-does-not-support-php7/#post-8043051

Would be great, if the plugin would get updated though :)

Does its job, but not in PHP7

I used to use this plugin on my site, but since upgrading to PHP 7.1, this plugin no longer works, therefore I've uninstalled it.

Doesn't work with PHP 7.1

WP Code Highlight provides clean syntax highlighting and it also provides a code button.

SyntaxHighlighter Amplified vs WP Code Highlight