PHP: filter_var_array - Manual

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

filter_var_array — Gets multiple variables and optionally filters them

Parameters

array: An associative array containing the data to filter.
options: Either an associative array of options, or the filter to apply to each entry, which can either be a validation filter by using one of the FILTER_VALIDATE_* constants, or a sanitization filter by using one of the FILTER_SANITIZE_* constants. The option array is an associative array where the key corresponds to a key in the data array and the associated value is either the filter to apply to this entry, or an associative array describing how and which filter should be applied to this entry. The associative array describing how a filter should be applied must contain the 'filter' key whose associated value is the filter to apply, which can be one of the FILTER_VALIDATE_*, FILTER_SANITIZE_*, FILTER_UNSAFE_RAW, or FILTER_CALLBACK constants. It can optionally contain the 'flags' key which specifies and flags that apply to the filter, and the 'options' key which specifies any options that apply to the filter.
add_empty: Add missing keys as null to the return value.

Return Values

An array containing the values of the requested variables on success, or false on failure. An array value will be false if the filter fails, or null if the variable is not set.

Examples

Example #1 A filter_var_array() example

<?php

$data = [
    'product_id' => 'libgd<script>',
    'component'  => '10',
    'versions'   => '2.0.33',
    'testscalar' => ['2', '23', '10', '12'],
    'testarray'  => '2',
];

$filters = [
    'product_id'   => FILTER_SANITIZE_ENCODED,
    'component'    => [
        'filter'   => FILTER_VALIDATE_INT,
        'flags'    => FILTER_FORCE_ARRAY,
        'options'  => [
            'min_range' => 1,
            'max_range' => 10,
        ],
    ],
    'versions'     => [
        'filter' => FILTER_SANITIZE_ENCODED
    ],
    'testscalar'   => [
        'filter' => FILTER_VALIDATE_INT,
        'flags'  => FILTER_REQUIRE_SCALAR,
    ],
    'testarray'    => [
        'filter' => FILTER_VALIDATE_INT,
        'flags'  => FILTER_FORCE_ARRAY,
    ],
    'doesnotexist' => FILTER_VALIDATE_INT,
];

var_dump(filter_var_array($data, $filters));

?>

The above example will output:

array(6) {
  ["product_id"]=>
  string(17) "libgd%3Cscript%3E"
  ["component"]=>
  array(1) {
    [0]=>
    int(10)
  }
  ["versions"]=>
  string(6) "2.0.33"
  ["testscalar"]=>
  bool(false)
  ["testarray"]=>
  array(1) {
    [0]=>
    int(2)
  }
  ["doesnotexist"]=>
  NULL
}

Found A Problem?

eguvenc at gmail dot com ¶

17 years ago

<?php
//an example of simply sanitize an array..

$data = array(
                '<b>bold</b>',
                '<script>javascript</script>',
                'P*}i@893746%%%p*.i.*}}|.dw<?php echo "echo works!!";?>');

$myinputs = filter_var_array($data,FILTER_SANITIZE_STRING);

var_dump($myinputs);

//OUTPUT:
//formarray(3) { [0]=> string(4) "bold" [1]=> string(10) "javascript" [2]=> string(26) "P*}i@893746%%%p*.i.*}}|.dw" }
?>

Anonymous ¶

3 years ago

To apply the same filter to many params/keys, use array_fill_keys().

<?php
$data = array(
    'product_id'    => 'libgd<script>',
    'component'     => '    10    ',
    'versions'      => '2.0.33',
    'testscalar'    => array('2', '23', '10', '12'),
    'testarray'     => '2',
);
$keys = array(
    'product_id',
    'component',
    'versions',
    'doesnotexist',
    'testscalar',
    'testarray'
);
$options = array(
    'filter' => FILTER_CALLBACK,
    'options' => function ($value) {
        return trim(strip_tags($value));
    },
);
$args = array_fill_keys($keys, $options);
/* Result
$args = array(
    'product_id' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
    'component' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
    'versions' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
    'doesnotexist' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
    'testscalar' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
    'testarray' => array(
        'filter' => FILTER_CALLBACK,
        'options' => function ($value) {
            return trim(strip_tags($value));
        },
    ),
);
*/

$myinputs = filter_var_array($data, $args);
var_dump($myinputs);

Output:

array(6) {
  'product_id' =>
  string(5) "libgd"
  'component' =>
  string(2) "10"
  'versions' =>
  string(6) "2.0.33"
  'doesnotexist' =>
  NULL
  'testscalar' =>
  array(4) {
    [0] =>
    string(1) "2"
    [1] =>
    string(2) "23"
    [2] =>
    string(2) "10"
    [3] =>
    string(2) "12"
  }
  'testarray' =>
  string(1) "2"
}

Vee W. ¶

7 years ago

$emails = [
    'a' => 'email1@domain.com',
    'b' => '<email2>@domain.com',
];

$result = filter_var_array($emails, FILTER_SANITIZE_EMAIL);
print_r($result);

// the result will be...
// array('a' => 'email1@domain.com', 'b' => 'email2@domain.com')

PHP: filter_var_array - Manual

Parameters

Return Values

Examples

See Also

Found A Problem?