How to Validate an Email Address in PHP – StackHowTo
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Simple input filtering in PHP | by John Morris | Medium
PHP Filters are used to sanitize data coming from outside world inside your application.
Validating an IP address with PHP's filter_var function | The Electric Toolbox Blog
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PHP Advanced Code code and more code Kyle
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