PHP filter_input() Function

Complete PHP Filter Reference

Definition and Usage

The filter_input() function filters gets input from outside the script and filters it.

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

This function can get input from several sources:

• INPUT_GET
• INPUT_POST
• INPUT_COOKIE
• INPUT_ENV
• INPUT_SERVER
• INPUT_SESSION (Not yet implemented)
• INPUT_REQUEST (Not yet implemented)

Returns the filtered data on success, FALSE on failure or NULL if the "variable" parameter is not set.

Syntax

filter_input(input_type, variable, filter, options)

Example

In this example we use the filter_input() function to filter a POST variable. The received POST variable is a valid e-mail address:

<?php
if (!filter_input(INPUT_POST, 'email', 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 valid

Complete PHP Filter Reference

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