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PHP filter_var() Function

PHP Filter Reference 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

PHP Filter Reference Complete PHP Filter Reference
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