复杂数组的 PHP 输入过滤 [英] PHP input filtering for complex arrays

问题描述

官方 PHP 文档声明 filter_var_array() 支持以下格式的数组过滤:

Official PHP documentation states that filter_var_array() supports array filtering in the following format:

$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);

但是，如果所讨论的数组是多维数组，并且需要针对不同部分使用不同的过滤器，那么您将如何定义过滤选项?

However, if the array in question is multi-dimensional and requires different filters for different parts, how would you approach defining filtering options?

举个例子:

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

推荐答案

Idea 1

考虑使用 FILTER_CALLBACK.这样就可以编写一个回调函数，本身使用过滤器扩展，从而提供递归能力.

Consider using FILTER_CALLBACK. In this way, you can write a callback function that itself uses the filter extension, thus providing a recursive ability.

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

这将生成回调函数.

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

这就是配置数组的样子.

This is what the config array would then look like.

想法 2

不要犹豫，为这个拍拍我的背，因为我为此感到非常自豪.

Do not hesitate to pat me on the back for this one because I am quite proud of it.

取一个看起来像这样的 arg 数组.斜线表示深度.

Take an arg array that looks like this. Slashes indicate depth.

$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)
);

假设您的数据看起来像这样.

Assume your data looks something like this.

$data = array(
    'user' => array(
        'age' => 15,
        'email' => '[e-mail]',
        'parent' => array(
            'age' => 38
        )
    ),
    'foo' => 5
);

然后，您可以生成一个引用数组，将诸如 'user/age' 之类的键映射到 $data['user']['age'].在最终制作中，您会得到如下内容:

Then, you can generate an array of references that map keys such as 'user/age' to $data['user']['age']. In final production, you get something like this:

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));

现在唯一的问题是您如何处理验证记录和原始数据集之间的不匹配.如果不知道您需要如何使用它们，我无法回答这个问题.

Now the only question is how you deal with the mismatch between the validation record and the original data set. This I cannot answer without knowing how you need to use them.

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