filter_list()

(PHP 5 >= 5.2.0, PHP 7)

返回所支持的过滤器列表

说明

filter_list(void): array

返回值

返回一个所支持的过滤器的名称的列表，如果没有这样子的过滤器的话则返回空数组。这个数组的索引不是过滤器id，你可以通过filter_id()去根据名称获取它们。

范例

一个filter_list()的例子

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

以上例程的输出类似于：

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
)

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
)

<?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

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>';
?>