ReorMadrid

To use it, you must use the [code] shortcode like this:
PHP Code Example:
[easycode] 
< ? php 
e cho “Hi, world!”; 
 ? > 
[/easycode]
In the admin menu, you have options to change the background colors, button colors, language and more.

Easy Code Highlighter

Displays code with syntax highlighting using Prism.js, real line numbering, and a copy button.

Andreas Hecht

Really simple to use and extrem lightweigt Code Highlighting with 8 different code highlighting themes. You can highlight your code with or without line numbers. It is based on Lea Verou’s <a href="http://prismjs.com/" title="Prism.js" rel="nofollow ugc">Prism.js</a>. Prism is used on several big websites like the Smashing Magazine, A list Apart, CSS Tricks, SitePoint and Drupal, because it is fast, simple and lightweight.
AH Code Highlighter supports PHP, HTML, CSS, JavaScript, Apache, HTTP, Sess, Lass, Markdown, Nginx, MySql, Xml, Mathml, JSON, Git, C, C# und C++ and more…
<h3>Demo</h3>
You can find a demo of the plugin on the plugin homepage: <a href="https://andreas-hecht.com/prism-syntax-highlighter/" title="AH Code Highlighter" rel="nofollow ugc">Plugin Homepage</a>
<h4>Basic Usage</h4>
Install and activate the plugin. Select your favorite Highlight Theme on the Options page (Settings => AH Code Highlighter). When you write a new post, click on the Code button, choose the code language and insert your code. Click OK and you’re done.

AH Code Highlighter

The easiest to use code highlighting ever. Choose between 8 different color themes to highlight your code snippets. Many programming languages are sup …

Easy Code Highlighter vs AH Code Highlighter