filter_input
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
filter_input — 指定した名前の変数を外部から受け取り、オプションでそれをフィルタリングする
説明
パラメータ
type-
INPUT_GET、INPUT_POST、INPUT_COOKIE、INPUT_SERVERあるいはINPUT_ENVのいずれか。 var_name-
取得する変数の名前。
filter-
適用するフィルタの ID。フィルタの型 に、利用できるフィルタの一覧があります。
省略した場合は
FILTER_DEFAULTを使います。これはFILTER_UNSAFE_RAWと同等です。 結果的に、デフォルトでは何もフィルタリングをしません。 options-
オプションあるいはフラグの論理和の連想配列。 オプションを指定可能なフィルタの場合、この配列の "flags" フィールドにフラグを指定します。
戻り値
成功した場合は要求された変数の値、フィルタリングに失敗した場合に false、
あるいは変数 var_name が設定されていない場合に
null を返します。フラグ FILTER_NULL_ON_FAILURE
が指定されている場合は、変数が設定されていなければ false、
フィルタリングに失敗したら null を返します。
例
例1 filter_input() の例
<?php
$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "You have searched for $search_html.\n";
echo "<a href='?search=$search_url'>Search again.</a>";
?>上の例の出力は、 たとえば以下のようになります。
You have searched for Me & son. <a href='?search=Me%20%26%20son'>Search again.</a>
参考
- filter_var() - 指定したフィルタでデータをフィルタリングする
- filter_input_array() - 外部から変数を受け取り、オプションでそれらをフィルタリングする
- filter_var_array() - 複数の変数を受け取り、オプションでそれらをフィルタリングする
- フィルタの型
＋add a note
User Contributed Notes 9 notes
CertaiN ¶
10 years ago
This function provides us the extremely simple solution for type filtering.
Without this function...
<?php
if (!isset($_GET['a'])) {
$a = null;
} elseif (!is_string($_GET['a'])) {
$a = false;
} else {
$a = $_GET['a'];
}
$b = isset($_GET['b']) && is_string($_GET['b']) ? $_GET['b'] : '';
?>
With this function...
<?php
$a = filter_input(INPUT_GET, 'a');
$b = (string)filter_input(INPUT_GET, 'b');
?>
Yes, FILTER_REQUIRE_SCALAR seems to be set as a default option.
It's very helpful for eliminating E_NOTICE, E_WARNING and E_ERROR.
This fact should be documented.
anthony dot parsons at manx dot net ¶
17 years ago
FastCGI seems to cause strange side-effects with unexpected null values when using INPUT_SERVER and INPUT_ENV with this function. You can use this code to see if it affects your server:
<?php
var_dump($_SERVER);
foreach ( array_keys($_SERVER) as $b ) {
var_dump($b, filter_input(INPUT_SERVER, $b));
}
echo '<hr>';
var_dump($_ENV);
foreach ( array_keys($_ENV) as $b ) {
var_dump($b, filter_input(INPUT_ENV, $b));
}
?>
If you want to be on the safe side, using the superglobal $_SERVER and $_ENV variables will always work. You can still use the filter_* functions for Get/Post/Cookie without a problem, which is the important part!
rimelek at rimelek dot hu ¶
10 years ago
If your $_POST contains an array value:
<?php
$_POST = array(
'var' => array('more', 'than', 'one', 'values')
);
?>
you should use FILTER_REQUIRE_ARRAY option:
<?php
var_dump(filter_input(INPUT_POST, 'var', FILTER_DEFAULT , FILTER_REQUIRE_ARRAY));
?>
Otherwise it returns false.
ss23 at ss23 dot geek dot nz ¶
14 years ago
Note that this function doesn't (or at least doesn't seem to) actually filter based on the current values of $_GET etc. Instead, it seems to filter based off the original values.
<?php
$_GET['search'] = 'foo'; // This has no effect on the filter_input
$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "You have searched for $search_html.\n";
echo "<a href='?search=$search_url'>Search again.</a>";
?>
If you need to set a default input value and filter that, use filter_var on your required input variable instead
Stefan Weinzierl ¶
10 years ago
Here is an example how to work with the options-parameter. Notice the 'options' in the 'options'-Parameter!
<?php
$options=array('options'=>array('default'=>5, 'min_range'=>0, 'max_range'=>9));
$priority=filter_input(INPUT_GET, 'priority', FILTER_VALIDATE_INT, $options);
?>
$priority will be 5 if the priority-Parameter isn't set or out the given range.
chris at chlab dot ch ¶
12 years ago
To use a class method for a callback function, as usual, provide an array with an instance of the class and the method name.
Example:
<?php
class myValidator
{
public function username($value)
{
// return username or boolean false
}
}
$myValidator = new myValidator;
$options = array('options' => array($myValidator, 'username'));
$username = filter_input(INPUT_GET, 'username', FILTER_CALLBACK, $options);
var_dump($username);
?>
akshay dot leadindia at gmail dot com ¶
11 years ago
The beauty of using this instead of directly using filter_var( $_GET['search'] ) is that you don't need to check if( isset( $_GET['search'] ) ) as if you pass that to filter_var and the key is not set then it will result in a warning. This function simplifies this and will return the relevant result to you (as per your options set) if the key has not been set in the user input.
If the type of filter you are using also supports a 'default' argument then this function will also stuff your missing input key with that value, again saving your efforts
travismowens at gmail dot com ¶
14 years ago
I wouldn't recommend people use this function to store their data in a database. It's best not to encode data when storing it, it's better to store it raw and convert in upon the time of need.
One main reason for this is because if you have a short CHAR(16) field and the text contains encoded characters (quotes, ampersand) you can easily take a 12 character entry which obviously fits, but because of encoding it no longer fits.
Also, while not as common, if you need to use this data in another place, such as a non webpage (perhaps in a desktop app, or to a cell phone SMS or to a pager) the HTML encoded data will appear raw, and now you have to decode the data.
In summary, the best way to architect your system, is to store data as raw, and encode it only the moment you need to. So this means in your PHP upon doing a SQL query, instead of merely doing an echo $row['title'] you need to run htmlentities() on your echos, or better yet, an abstract function.
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