How To Filter Variable in PHP - filter_var() Function - Tech Fry
Getting Started with PHP Regular Expressions | The Jotform Blog
php - filter_var and validating integer values - Stack Overflow
Fixing 'Call to Undefined Function' Filter_Var() in PHP
GitHub - Xib3rR4dAr/filter-var-sqli: Bypassing FILTER_SANITIZE_EMAIL & FILTER_VALIDATE_EMAIL filters in filter_var for SQL Injection ( xD )
php - Does chaining filter_input() and filter_var() cause the problem? - Stack Overflow
PHP filter_var function bypass
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
Validating an IP address with PHP's filter_var function | The Electric Toolbox Blog