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PHP input filtering for complex arrays
$data = array(
    'testarray'    => array('2', '23', '10', '12')
);

$args = array(
    'testarray'    => array('filter'    => FILTER_VALIDATE_INT,
                            'flags'     => FILTER_FORCE_ARRAY
                           )
);

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

$data = array(
    'testhash'    => array('level1'=>'email',
                           'level2'=> array('23', '10', '12'))
);

function validate_array($args) {
    return function ($data) use ($args) {
        return filter_input_array($data, $args);
    };
}

$args = array(
    'user' => array(
        'filter' => FILTER_CALLBACK,
        'options' => validate_array(array(
            'age' => array('filter' => FILTER_INPUT_INT),
            'email' => array('filter' => FILTER_INPUT_EMAIL)
        ))
    )
);

$args = array(
    'user/age' => array('filter' => FILTER_INPUT_INT),
    'user/email' => array('filter' => FILTER_INPUT_EMAIL),
    'user/parent/age' => array('filter' => FILTER_INPUT_INT),
    'foo' => array('filter' => FILTER_INPUT_INT)
);

$data = array(
    'user' => array(
        'age' => 15,
        'email' => 'foo@gmail.com',
        'parent' => array(
            'age' => 38
        )
    ),
    'foo' => 5
);

function my_filter_array($data, $args) {
    $ref_map = array();
    foreach ($args as $key => $a) {
        $parts = explode('/', $key);
        $ref =& $data;
        foreach ($parts as $p) $ref =& $ref[$p];
        $ref_map[$key] =& $ref;
    }
    return filter_var_array($ref_map, $args);
}

var_dump(my_filter_array($data, $args));

/** Like filter_var_array but recursive, this way you can nest your filters.
 * Small caveat : if an array in filters contains the keys 'filter' and
 * 'options' it will be considered as a filter rule.
 * param $data (mixed) : data to filter.
 * param $filters (mixed) : array of filters or filter.
 * return filtered data. Unknown fields will be deleted.
 * */
function filter_var_recursive($data, $filters) {
    // Just a rule, don't recurse.
    if(!is_array($filters))
        return filter_var($data, $filters);

    // Only a detailed rule, don't recurse.
    if(array_key_exists('options', $filters) && array_key_exists('filter', $filters)) {
        // Hackish but ok.
        $ret = filter_var_array(array('value' => $data), array('value' => $filters));
        return $ret['value'];
    }

    // At this point the data should be an array, if it's not, we don't care.
    if(!is_array($data))
        $data = array();

    // Iterate and recurse.
    $ret = array();
    foreach($filters as $key => $filter) {
        if(!array_key_exists($key, $data))
            $ret[$key] = null;
        else
            $ret[$key] = filter_var_recursive($data[$key], $filter);
    }

    return $ret;
}