Michael Ott

It’s often too easy to make edits to your web site that result in a broken link. This plugin will automatically email the web site administrator (or a specified email address) whenever a 404 is encountered, along with a link to the page the 404 originated from. With this knowledge in hand, you can search the page for the problem and either remove or fix it.
Notifications are also triggered by missing media, such as images, video, CSS files and more.
<h3>Support</h3>
Report any issues at the official <a href="https://wordpress.org/support/plugin/404-notify/" rel="ugc">404 Notify Support</a> WordPress page.
<h3>How to use</h3>
Once activated, notifications are automatially sent to the site administrator, or, you can specify an alternative email address in Settings -> General and look for the 404 Notify email address field.
<h3>Uninstall</h3>
Deactivate the plugin, delete if desired.

404 Notify

It works as presented. When an internal link leads to 404 you get an email alert. 

Job well done

Get a notification whenever a 404 is encountered on your web site.

Gregory

The Plugin Inspector plugin is an easy way to check plugins installed on your WordPress and make sure that plugins do not use deprecated WordPress functions and some unsafe functions like eval, base64_decode, system, exec, etc. Some of those functions may be used to load malicious code (malware) from the external source directly to the site or WordPress database.
Features
<ul>
<li>Scans plugins for deprecated WordPress functions</li>
<li>Scans plugins for unsafe functions like eval, base64_decode, system, exec, etc.</li>
<li>Checks plugins to find vulnerabilities listed in WPScan Vulnerability Database</li>
<li>Beautiful source code viewer with highlighting</li>
</ul>
Plugin Inspector allows you to view all the deprecated functions complete with path, line number, deprecation function name, and the new recommended function to use. The checks are run through a simple admin page and all results are displayed at once. This is very handy for plugin developers or anybody who want to know more about installed plugins.
All code that uses the deprecated functions should be converted to use its replacement if one exists. Because deprecated functions are no longer supported may be removed from future versions of WordPress.
To check the theme files, please, use Theme Check plugin.
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Plugin Inspector

Every plugin developer should be using this.
Thankyou Gioni.



Beautiful

Very useful for plugin developers to run a quick check of their code throughout development.



Great plugin

Works as advertised. Very scary to see so many plugins have so many security issues. As long as WordPress allows unsafe themes and plugins to get activated, it will never be safe, no matter how much they secure the core.



Very Cool !

Thank you very much for developing this plugin and keeping it up-to date.
Thankful to your efforts and time.



Nice Plugin

Checks plugins for deprecated WordPress functions, known security vulnerabilities and some unsafe PHP functions

404 Notify vs Plugin Inspector