filter_input

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

    filter_input — Gets a specific external variable by name and optionally filters it

    Description

    filter_input(
        int $type,
        string $var_name,
        int $filter = FILTER_DEFAULT,
        array|int $options = 0
    ): mixed

    Parameters

    type

    One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.

    var_name

    Name of a variable to get.

    filter

    The ID of the filter to apply. The Types of filters manual page lists the available filters.

    If omitted, FILTER_DEFAULT will be used, which is equivalent to FILTER_UNSAFE_RAW. This will result in no filtering taking place by default.

    options

    Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array.

    Return Values

    Value of the requested variable on success, false if the filter fails, or null if the var_name variable is not set. If the flag FILTER_NULL_ON_FAILURE is used, it returns false if the variable is not set and null if the filter fails.

    Examples

    Example #1 A filter_input() example

    <?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>";
    ?>

    The above example will output something similar to:

    You have searched for Me &#38; son.
<a href='?search=Me%20%26%20son'>Search again.</a>

    See Also

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    User Contributed Notes 9 notes

    up
    100
    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.
    up
    48
    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!
    up
    41
    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.
    up
    32
    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
    up
    22
    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.
    up
    10
    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);
    ?>
    up
    4
    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
    up
    5
    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.
    up
    0
    HonzaZ
    2 years ago
    In fastcgi sapi implementations, filter_input(INPUT_SERVER) can return empty results.

    In my case (8.1.9 64bit php-cgi) it was caused by auto_globals_jit enabled . When disabled (in php.ini on php startup), filter_input(INPUT_SERVER) works correctly.

    php-fpm sapi isn't affected.
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