PHP Filters are used to sanitize data coming from outside world inside your application.
What is a PHP Filter? | PHP Filter Functions Tutorial - PhpGurukul
filter_var/filter_var.php at master · javazac/filter_var · GitHub
You Should Be Using PHP Filtering Functions, Part 1 | Tom McFarlin
MySQL – HTML Form Validation with PHP (filter_var) – Eli the Computer Guy
filter_var - Explore | Facebook
PHP Front To Back [Part 14] - Filters & Validation - YouTube
PHP filter_var function bypass
PHP Filters
PHP filter_var() Function - YouTube
RIPS Technologies on Twitter: "Be careful when using filter_var() for validating user input. Can you spot the vulnerability? #PHP #coding #codechallenge https://t.co/NM8r7DLl0k" / Twitter