Checks plugins for deprecated WordPress functions, known security vulnerabilities and some unsafe PHP functions
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
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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Generally, most of those functions are safe, but under certain circumstances those functions may be used to hack site or to load and execute malicious code (malware). This list is not full and will be constantly updating. Any suggestions are welcome.