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PHP filter_input() Function

< PHP Filter Reference

Example

Check if the external variable "email" is sent to the PHP page, through the "get" method, and also check if it is a valid email address:

<?php
if (!filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL)) {
echo("Email is not valid");
} else {
echo("Email is valid");
}
?>

Definition and Usage

The filter_input() function gets an external variable (e.g. from form input) and optionally filters it.

This function is used to validate variables from insecure sources, such as user input.

Syntax

filter_input(type, variable, filter, options)

Parameter	Description
type	Required. The input type to check for. Can be one of the following: INPUT_GET INPUT_POST INPUT_COOKIE INPUT_SERVER INPUT_ENV
variable	Required. The variable name to check
filter	Optional. Specifies the ID or name of the filter to use. Default is FILTER_DEFAULT, which results in no filtering
options	Optional. Specifies one or more flags/options to use. Check each filter for possible options and flags

Technical Details

Return Value:	Returns the value of the variable on success, FALSE on failure, or NULL if the "variable" parameter is not set
PHP Version:	5.2.0+

< Complete PHP Filter Reference