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1. www.php.net › manual › enPHP: filter_var - Manual

   www.php.net › manual › en

   Filters a variable with a specified filter

2. www.w3schools.com › php › func_filter_varPHP filter_var () Function - W3Schools

   www.w3schools.com › php › func_filter_var

   Definition and Usage The filter_var () function filters a variable with the specified filter.

3. www.phptutorial.net › php-tutorial › php-filter_varPHP filter_var Function

   www.phptutorial.net › php-tutorial › php-filter_var

   In this tutorial, you will learn how to use the PHP filter_var() function to sanitize and validate data.

4. durak.org › php-8 › functionFilters a variable with a specified filter - PHP 8.3.0 Manual ...

   durak.org › php-8 › function

   Mar 17, 2026 · Parameters value Value to filter. Note that scalar values are converted to string internally before they are filtered. filter The ID of the filter to apply. The Types of filters manual page lists the available filters. If omitted, FILTER_DEFAULT will be used, which is equivalent to FILTER_UNSAFE_RAW. This will result in no filtering taking place by default. options Associative array of options ...

5. www.w3docs.com › snippets › phpHow to Use the filter_var () Function in PHP - W3docs

   www.w3docs.com › snippets › php

   Below, we will consider several use cases of the filter_var () function. Sanitizing a String In the example, demonstrated below, you can see how to sanitize a string with filter_var (): It will remove all HTML tags from the string.

6. symfony-exam.com › blog › php-80-the-filtervarWhat is the Purpose of the `filter_var ()` Function in PHP?

   symfony-exam.com › blog › php-80-the-filtervar

   Jan 29, 2026 · The filter_var() function is part of PHP's filter extension, which provides a set of functions to validate and sanitize data. The primary purpose of filter_var() is to perform both validation and sanitization based on the specified filter type.

7. People also ask

   What is filter_var function?

   • The filter_var () function filters a variable with the specified filter. This function is used to both validate and sanitize the data. Syntax :- var : It is the required field. It denotes the variable to filter. filtername : It is used to specify the ID or name of the filter to use. Default is FILTER_DEFAULT, which results in no filtering.

   PHP | filter_var() Function - GeeksforGeeks

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   How to filter a variable using a validation or sanitization filter?

   • The filter_var() function allows you to filter a variable using a validation or sanitization filters. Here’s the syntax of the filter_var() function: The filter_var() function has three parameters: $value is the value you want to validate or sanitize. $filter is the filter id to apply.

   PHP filter_var Function

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   How do I filter a variable?

   • Filter a variable using a FILTER_VALIDATE_ * validation filters, a FILTER_SANITIZE_ * sanitization filters, or a custom filter. Value to filter. Scalar values are converted to string internally before they are filtered. The filter to apply.

   PHP: filter_var - Manual

   www.php.net/manual/en/function.filter-var.php

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   What does var mean in a filter?

   • var : It is the required field. It denotes the variable to filter. filtername : It is used to specify the ID or name of the filter to use. Default is FILTER_DEFAULT, which results in no filtering. It is optional field. options : It is used to specify one or more flags/options to use. Check each filter for possible options and flags.

   PHP | filter_var() Function - GeeksforGeeks

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8. www.geeksforgeeks.org › php › php-filter_var-functionPHP | filter_var() Function - GeeksforGeeks

   www.geeksforgeeks.org › php › php-filter_var-function

   Nov 18, 2019 · The filter_var () function filters a variable with the specified filter. This function is used to both validate and sanitize the data. Syntax :- filter_var(var, filtername, options) Parameters: This function accepts three parameters and are described below: var : It is the required field. It denotes the variable to filter.