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filter_list

(PHP 5 >= 5.2.0, PHP 7)

filter_listReturns a list of all supported filters

Description

filter_list ( void ) : array

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
)

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User Contributed Notes 3 notes

up
5
El diablo
1 year 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
-1
vb dot jyoti at gmail dot com
11 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
-6
larry at weblabsperth dot com dot au
3 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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