Savan Dholu

This Plugin gives you the functionality when the user clicks on Add to Cart button it will clear all previous cart data entirely and add new cart data, only allow one product purchase at a time.

Allow Only Last Item In Cart

Just added working automatically 
Relevant and Better!!

An Amazing Plugin

This Plugin gives you the functionality when the user clicks on Add to Cart button it will clear all previous cart data entirely and add new cart data …

Pippin Williamson

Modifies the Empty Spam action in WordPress to process the spam deletion in batches, allowing you to delete thousands or even hundreds of thousands of spam comments at once without killing your server.
Have you found a bug or have a suggestion or improvement you’d like to submit? This plugin is available on <a href="https://github.com/pippinsplugins/batch-comment-spam-deletion" rel="nofollow ugc">Github</a> and pull requests are welcome!

Batch Comment Spam Deletion

Modifies the Empty Spam action in WordPress to process the spam deletion in batches instead of all at once.

Allow Only Last Item In Cart vs Batch Comment Spam Deletion