What is the primary purpose of Filter Functions in PHP?

Comprehensive guide to PHP data sanitization and validation filter functions and filter constants.

Are Filter Functions enabled by default in PHP 8?

Yes, standard Filter Functions are core parts of the PHP standard library and require no external PECL extensions.

PHP Filter Functions Reference Guide

This reference page provides a comprehensive, alphabetical catalog of all built-in Filter Functions in PHP. In modern web development and university exams (BCA, BSc CS, B.Tech), understanding these core functions accelerates programming speed and prevents you from reinventing existing standard library tools.

Quick Tip: In modern PHP 8, you can use named arguments to specify parameters without having to memorize optional default argument positions!

Function	Description
filter_has_var	Checks if variable of specified type exists
filter_id	Returns the filter ID belonging to a named filter
filter_input_array	Gets external variables and optionally filters them
filter_input	Gets a specific external variable by name and optionally filters it
filter_list	Returns a list of all supported filters
filter_var_array	Gets multiple variables and optionally filters them
filter_var	Filters a variable with a specified filter

PHP Filter Functions Reference Guide

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