k0tik

The usual Text widget allows you to insert arbitrary Text and/or HTML code. This allows that too, but also parses any PHP or JavaScript code in the text widget and executes it.
This plugin is based on “PHP Code Widget”, but now available for use by site administrators ONLY, which makes it more secure.
All PHP code must be enclosed in the standard php opening and closing tags ( <code><?php</code> and <code>?></code> ) for it to be recognized and executed. Also JavaScript code must be enclosed in the <code><script></code> and <code></script></code> tags, as usual.

Safe PHP Code Widget

Adds a secure and simple widget in which you can use PHP and JavaScript code. Also you can use unfiltered HTML or just Text. Admin Use Only.

Michael

Billy

This plugin, developed by <a href="https://2mb.solutions/" rel="nofollow ugc">2MB Solutions</a>, allows you to place predetermined text/html/php at the top and/or bottom of each post. In addition, you can override the placing of text at the bottom and/or top of a specific post, override the placing of text on the homepage or on a post individually, or run arbitrary php inside a post.
For more on 2MB, please visit (https://2mb.solutions/).
Note that all development now takes place at <a href="https://github.com/2mb-solutions/autocode/" rel="nofollow ugc">github</a>.

2MB Autocode

This plugin allows you to place predetermined text/html/php at the top or bottom of posts.

Safe PHP Code Widget vs 2MB Autocode