PHP filter_id() Function

The PHP filter_id() function returns the filter ID belonging to a named filter.

Syntax

filter_id(name)

Parameters

name Required. Specify the name of a filter to get the id from. The list of all supported filters name can be obtained using filter_list() function.

Return Value

Returns the ID of a filter on success or false if filter does not exist.

Example:

In the example below, filter_id() function is used to find the ID of validate_email filter.

<?php
print_r(filter_id('validate_email'));
?>

The output of the above code will be:

Example:

In the example below, filter_id() function is used with filter_list() function to find all out the filter ID of all supported filters.

<?php
foreach (filter_list() as $id => $filter) {
  $result[$filter] = filter_id($filter);
}

print_r($result);
?>

The output of the above code will be:

Array
(
    [int] => 257
    [boolean] => 258
    [float] => 259
    [validate_regexp] => 272
    [validate_domain] => 277
    [validate_url] => 273
    [validate_email] => 274
    [validate_ip] => 275
    [validate_mac] => 276
    [string] => 513
    [stripped] => 513
    [encoded] => 514
    [special_chars] => 515
    [full_special_chars] => 522
    [unsafe_raw] => 516
    [email] => 517
    [url] => 518
    [number_int] => 519
    [number_float] => 520
    [add_slashes] => 523
    [callback] => 1024
)

❮ PHP Filter Reference