PHP string cleaner
In this example I used two regular expressions to clean the inserted text of all symbols, extra hyphens and extra white spaces so the end result is clean text structure that contains lowercase words, and only one hyphen between each word. This has many use case scenarios, for example, you can use it in a custom CMS for inserting clean blog titles, or url-s, based on the text that the author inserts in a textfield.
PHP + Bootstrap-4 shopping cart
This is a Bootstrap-4 + PHP + jQuery responsive shopping cart example, utilizing Php filter_input function, and a few other concepts and basic control flow statements. Not fancy, but very effective.
Materialize CSS gives the app google-like look and feel, and Ecmascript defines the functionality - adding and removing the tasks.
jQuery Bootstrap-4 contact form validation
Interactive Bootstrap-4 & jQuery contact form with multiple client side validations. Very simple, but useful.