filter_var_array

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

filter_var_array — 获取多个变量并且过滤它们

说明

filter_var_array(array $array, array|int $options = FILTER_DEFAULT, bool $add_empty = true): array|false|null

不需要重复调用 filter_var() 就能获取多个变量。

参数

array

数组，键为字符串，值为待过滤的数据。

options

一个定义参数的数组。一个有效的键必须是一个包含变量名的string，一个有效的值要么是一个filter type，或者是一个array 指明了过滤器、标示和选项。如果值是一个数组，那么它的有效的键可以是 filter，用于指明 filter type，flags 用于指明任何想要用于过滤器的标示，或者 options 用于指明任何想要用于过滤器的选项。参考下面的例子来更好的理解这段说明。

这个参数也可以是一个filter constant的整数。那么数组中的所有值都会被这个过滤器所过滤。

add_empty

在返回值中添加 null 作为不存在的键。

返回值

如果成功则返回一个包含所请求变量的数组，或者当失败时返回 false 。一个数组的值如果过滤失败则为 false ，或者为 null 如果变量不存在的话。

示例

示例 #1 一个 filter_var_array() 的例子

<?php

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

$args = array(
    'product_id'   => FILTER_SANITIZE_ENCODED,
    'component'    => array('filter'    => FILTER_VALIDATE_INT,
                            'flags'     => FILTER_FORCE_ARRAY, 
                            'options'   => array('min_range' => 1, 'max_range' => 10)
                           ),
    'versions'     => FILTER_SANITIZE_ENCODED,
    'doesnotexist' => FILTER_VALIDATE_INT,
    'testscalar'   => array(
                            'filter' => FILTER_VALIDATE_INT,
                            'flags'  => FILTER_REQUIRE_SCALAR,
                           ),
    'testarray'    => array(
                            'filter' => FILTER_VALIDATE_INT,
                            'flags'  => FILTER_FORCE_ARRAY,
                           )

);

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

var_dump($myinputs);
echo "\n";
?>

以上示例会输出：

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

参见

filter_input_array() - 获取一系列外部变量，并且可以通过过滤器处理它们
filter_var() - 使用特定的过滤器过滤一个变量
filter_input() - 通过名称获取特定的外部变量，并且可以通过过滤器处理它
过滤器类型

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＋添加备注

用户贡献的备注 5 notes

down

eguvenc at gmail dot com ¶

15 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" }

?>

down

Vee W. ¶

5 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')

down

Anonymous ¶

1 year 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"
}

down

-1

tongcheong77 at gmail dot com ¶

7 years ago

for those who would like to know how to use regular expressions with filter var array. taken from w3 schools.

$data = array(
  
  'regxp' =>  'michael'
  
  );

$args = array(
  
  'regxp'  =>  array(
  
  'filter'=>FILTER_VALIDATE_REGEXP | FILTER_SANITIZE_STRING,
  'options'=>array('regexp'=>"/^michael$/"),
  
  ));
  
$output=filter_var_array($data,$args);

var_dump($output); // array(1) { ["regxp"]=> string(7) "michael" } 

- bruce tong

down

-2

tongcheong77 at gmail dot com ¶

7 years ago

an update to previous post.

using regular expressions along with another filter in filter var array

$data = array(
  
  'regxp' =>  "`\tcafé\n`"
  
  );

$args = array(  
  
  'regxp'  =>  array(
  
  'filter'=>FILTER_VALIDATE_REGEXP | FILTER_SANITIZE_STRING,
  'flags'=>FILTER_FLAG_STRIP_HIGH | FILTER_FLAG_STRIP_LOW | FILTER_FLAG_STRIP_BACKTICK,
  'options'=>array('regexp'=>"/t(.*)/"),
  
  ));
  
$output=filter_var_array($data,$args);

var_dump($output); // array(1) { ["regxp"]=> string(3) "caf" } 

-bruce tong