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filter_list

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

filter_listReturns a list of all supported filters

Description

filter_list(): array

Parameters

This function has no parameters.

Return Values

Returns an array of names of all supported filters, empty array if there are no such filters. Indexes of this array are not filter IDs, they can be obtained with filter_id() from a name instead.

Examples

Example #1 A filter_list() example

<?php
print_r
(filter_list());
?>

The above example will output something similar to:

Array
(
    [0] => int
    [1] => boolean
    [2] => float
    [3] => validate_regexp
    [4] => validate_url
    [5] => validate_email
    [6] => validate_ip
    [7] => string
    [8] => stripped
    [9] => encoded
    [10] => special_chars
    [11] => unsafe_raw
    [12] => email
    [13] => url
    [14] => number_int
    [15] => number_float
    [16] => magic_quotes
    [17] => callback
)

add a note

User Contributed Notes 4 notes

up
6
El diablo
6 years ago
Get filter_list() with filter_id() as key.

<?php
print_r
(array_flip(array_map('filter_id', array_combine(filter_list(), filter_list()))));
?>

Array
(
[257] => int
[258] => boolean
[259] => float
[272] => validate_regexp
[277] => validate_domain
[273] => validate_url
[274] => validate_email
[275] => validate_ip
[276] => validate_mac
[513] => stripped
[514] => encoded
[515] => special_chars
[522] => full_special_chars
[516] => unsafe_raw
[517] => email
[518] => url
[519] => number_int
[520] => number_float
[521] => magic_quotes
[1024] => callback
)
up
0
shaman_master at list dot ru
4 years ago
2 strings, but it's faster (-2 calls) and not the longest
<?php
$filters
= filter_list();
$filters = array_combine($filters, array_map('filter_id', $filters));
?>
also I use id's as values: $filters[$filter] - get filter id by name
up
1
vb dot jyoti at gmail dot com
15 years ago
<?php
echo "<pre>";
print_r(filter_list());
echo
"</pre>";
foreach (
filter_list() as $key => $value)
{
echo
"<br>".$key."=".$value.'='.filter_id($value);
}
?>

0=int=257
1=boolean=258
2=float=259
3=validate_regexp=272
4=validate_url=273
5=validate_email=274
6=validate_ip=275
7=string=513
8=stripped=513
9=encoded=514
10=special_chars=515
11=unsafe_raw=516
12=email=517
13=url=518
14=number_int=519
15=number_float=520
16=magic_quotes=521
17=callback=1024
up
-14
larry at weblabsperth dot com dot au
7 years ago
Output a table of Filter IDs as Integers with corresponding Constant IDs:

<?php

echo '<table>';
echo
'<tr>';
echo
'<th>Filter Name</th>';
echo
'<th>Filter Int ID</th>';
echo
'<th>Filter Const ID</th>';
echo
'</tr>';

foreach (
filter_list() as $id =>$filter) {
$const = 'FILTER_';
switch(
$filter) {
case
'int':
case
'boolean':
case
'float':
$const .= 'VALIDATE_' . $filter;
break;

case
'string':
case
'stripped':
case
'encoded':
case
'special_chars':
case
'full_special_chars':
case
'unsafe_raw':
case
'email':
case
'url':
case
'number_int':
case
'number_float':
case
'magic_quotes':
$const .= 'SANITIZE_' . $filter;
break;
}

if (
substr($filter,0,8)=='validate' || $filter=='callback')
$const .= $filter;

echo
'<tr><td>' . $filter . '</td><td align="center">' . filter_id($filter) . '</td><td>' . strtoupper($const) . '</td></tr>';
}

echo
'</table>';

?>
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