Sharaz Shahid

Code Widget is simple widget allows you to insert any arbitrary Text/HTML and run PHP Code or Short Code. This Widget parses PHP code into simple text and much more.
Only users with the unfiltered_html role will be allowed to insert unfiltered HTML. This includes PHP code, so users without admin or editor permissions will not be able to use this to execute code, even if they have widget editing permissions. 
This plugin is developed and maintained by <a href="https://twitter.com/sharazghouri1" rel="nofollow ugc">Sharaz Shahid</a>

Code Widget

Code widget help  to  add  Short Code, PHP Code, HTML, and Simple Text in widget.

Rik Schennink

Use Snippy to quickly create your own custom shortcodes.
A Snippy shortcode is built by combining bits. A bit can be a file, like a Stylesheet or a Script, or a piece of code, like HTML, CSS or JavaScript.
The “code” bits can contain placeholders, which are automatically made accessible as shortcode attributes.
Time for a quick example.
Let’s create a shortcode to embed YouTube videos. We’ll add an HTML bit and set the it’s value to the YouTube embed iframe.
<pre><code><iframe src="https://youtube/embed/JZYYJY4yoK4"/>
</code></pre>
Now to make this bit a bit more flexible we will replace the YouTube video id with a placeholder value <code>{{id}}</code>.
<pre><code><iframe src="https://youtube/embed/{{id}}"/>
</code></pre>
Yay! We’ve finished our first bit!
Now we can create a new Snippy shortcode and add the YouTube iFrame HTML bit. After saving the shortcode we can use our new and shiny YouTube shortcode in the text editor.
<pre><code>[youtube id=JZYYJY4yoK4]
</code></pre>
Ready for more?
The below 3 minute YouTube video shows how you can use Snippy to turn a jQuery plugin into a WordPress plugin.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/JZYYJY4yoK4?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Snippy

Makes it easy to create your own custom shortcodes.

Code Widget vs Snippy