PHP MYSQL Tutorial 5 | How To Filter Input Variables In PHP - YouTube
PHP 7.3, "filter_var(): explicit use of FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED is deprecated" · Issue #1572 · PHPMailer/PHPMailer · GitHub
Validating User Input With the filter_var() Function
PHP filter_var shenanigans : r/PHP
PHP bug allows attackers to bypass domain filters, stage DoS attacks against servers | The Daily Swig