PHP filter_var | How does the filter_var function work in Php?
PHP Basics
PHP, verify email address and IP address using filter_var - YouTube
GitHub - stymiee/email-validator: The Email Validator library builds upon PHP's built in `filter_var($emailAddress, FILTER_VALIDATE_EMAIL);` by adding a default MX record check. It also offers additional validation against disposable email addresses ...
How to Create PHP Email Contact Form with Attachment with Source Code
MySQL – HTML Form Validation with PHP (filter_var) – Eli the Computer Guy
Validation of email id in PHP | HTML | Using validate email id | - YouTube