GitHub - circunspecter/php-filter-wrapper: Class which facilitates the use of filters in batches when validate or sanitize data.
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In Drupal 7 Views what is the php code to validate a field against a contextual filter argument? - Drupal Answers
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php - Validating year & week using filters. How to notify specific out of range parameter? - Stack Overflow
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How to Validate (and Sanitize) User Input In PHP Using Filter_Input() and Filter_Var() | by John Morris | Medium
![PHP bug allows attackers to bypass domain filters, stage DoS attacks against servers | The Daily Swig PHP bug allows attackers to bypass domain filters, stage DoS attacks against servers | The Daily Swig](https://portswigger.net/cms/images/8a/df/c803-article-220401-php-main.png)