ext/filter: `filter_var_array` with `FILTER_VALIDATE_INT|FILTER_NULL_ON_FAILURE` as `$options` fails.

[Girgias]

Description

The following code:

<?php
$data = [
    'product_id' => '42',
    'component'  => '10.36',
];

var_dump(filter_var_array($data, FILTER_VALIDATE_INT|FILTER_NULL_ON_FAILURE));

Resulted in this output:

Warning: filter_var_array(): Unknown filter with ID 134217985 in %s on line %d
bool(false)

But I expected this output instead:

array(2) {
  ["product_id"]=>
  int(42)
  ["component"]=>
  NULL
}

PHP Version

PHP 5.4.0 to master

Operating System

No response

[nielsdos]

I don't think this is actually a bug, maybe this can be classified as a limitation but at least it seems documented.
Reading the docs at https://www.php.net/manual/en/function.filter-var-array.php reveals that FILTER_NULL_ON_FAILURE is not a valid flag for $options. Reading the documentation further shows that this can be done with the array variation:

<?php
$data = [
    'product_id' => '42',
    'component'  => '10.36',
];

var_dump(filter_var_array($data, [
    'component' => [
        'filter' => FILTER_VALIDATE_INT,
        'flags' => FILTER_NULL_ON_FAILURE,
    ]
]));