<ul data-eligibleForWebStory="true"><li>PHP's filter_input function simplifies input validation and sanitization in web development to prevent security vulnerabilities.</li><li>Basic syntax of filter_input: filter_input(int $type, string $variable_name, int $filter = FILTER_DEFAULT, array|int $options = 0);</li><li>Common filtering techniques include validating email input, sanitizing strings, validating integers, filtering URLs, using filter flags, and sanitizing and validating arrays.</li><li>Pros of filter_input: built-in, easy to use, reduces manual validation; Cons: limited flexibility compared to custom validation libraries. Consider using libraries like Laravel Validator or Symfony’s Validator Component for complex validation.</li></ul>

Mastering Input Filtering in PHP: A Guide to `filter_input` Techniques

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