# PHP filter_var() Function

Complete PHP Filter Reference

## Definition and Usage

The filter_var() function filters a variable with the specified filter.
Returns the filtered data on success or FALSE on failure.

## Syntax

filter_var(variable, filter, options)

Parameter | Description
--- | ---
variable | Required. Specifies the variable to filter
filter | Optional. Specifies the ID of the filter to use. Default is FILTER_SANITIZE_STRING. Check the Complete PHP Filter Reference for possible filters A filter ID can be an ID name (like FILTER_VALIDATE_EMAIL) or an ID number (like 274)
options | Optional. Specifies an associative array of flags/options or a single flag/option. Check each filter for possible options and flags

## Example

<?php
if(!filter_var("someone@example....com", FILTER_VALIDATE_EMAIL))
{
echo("E-mail is not valid");
}
else
{
echo("E-mail is valid");
}
?>

The output of the code should be:

E-mail is not valid

Complete PHP Filter Reference

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