如何通过引用动态设置多维数组中的值 [英] How to dynamically set value in multidimensional array by reference

问题描述

这让我整个晚上都发疯了.基本上，我需要在清理值后在多维数组中设置特定值，然后在验证值后再次设置(可能取决于验证；如果验证失败则需要将值设置为空字符串).假设我有这个帖子数组:

$data['should']['be']['int'] = 'yjd';

使用 filter_var( $value, FILTER_SANITIZE_NUMBER_INT ); 清理值后，我得到一个空字符串.然后我需要以某种方式将 $data['should']['be']['int'] 上的值设置为空字符串.

这个值然后被传递给一个验证函数，它失败了，因为空字符串不是一个整数.同样，该验证值需要在 $data['should']['be']['int'] 中设置为空字符串.

在整个验证开始之前，我将所有相关的键保存在一个数组中，所以当我需要清理或验证时，我已经有了这样的东西:

$keys = 数组(0 =>'应该'，1 =>'是'，2 =>'int');

我尝试通过引用 &$data 数组来设置新值，然后在 foreach 循环中使用上述键访问 $data 数组，但无论我尝试什么，都无法做到.以上只是一个简化的例子.整个事情是验证类的一部分，所以我不知道传递的 $data 数组的确切深度.

任何指针将不胜感激！感谢您的帮助！

以为我无法编辑帖子，但它最终只是我的互联网连接.请无视我下面的评论.无论如何，这是我尝试递归调用的方法:

受保护的函数 set_value( &$data, $value ) {foreach( $data as &$val ) {if( is_array( $val ) ) {$this->set_value( $val, $value );} 别的 {$val = $value;}}}

为了开始循环，我这样做了:

$this->set_value( $data[$keys[0]], $value );

解决方案

你可以试试

$data = array();$keys = 数组(0 =>'应该'，1 =>'是'，2 =>'int');$value = 'yjd';echo "
";setValue($data,$keys,$value);打印_r($数据);
输出
数组([应该] =>大批([是] =>大批([int] =>yjd)))
使用的函数
function setValue(&$data, $path, $value) {$temp = &$data;foreach ( $path 作为 $key ) {$temp = &$temp[$key];}$temp = $value;返回 $value ;}
This has been driving me nuts all evening. Basically, I need to set a specific value in a multidimensional array after sanitizing the value and then again (maybe, depends on validation; if validation failed then the value needs to be set to an empty string) after validating the value. Let's say I have this post array:
$data['should']['be']['int'] = ' yjd';
After sanitizing the value with filter_var( $value, FILTER_SANITIZE_NUMBER_INT ); I'm getting an empty string back. I would then need to somehow set the value on $data['should']['be']['int'] to be an empty string.

This value then gets passed to a validation function, which fails, cause the empty string is not an integer. Again, that validated value would then need to get set in $data['should']['be']['int'] to an empty string.

Before the whole validation thing kicks off I'm saving all relevant keys in an array, so by the time I need to sanitize or validate I've got something like this available:
$keys = array(
    0 => 'should',
    1 => 'be',
    2 => 'int'
);
I've tried to then access the $data array using the above keys in a foreach loop by referencing the &$data array to set the new value, but haven't been able to, no matter what I tried. The above is just a simplified example. The whole thing is part of a validation class, so I don't know the exact depth of the passed $data array. 

Any pointers would be greatly appreciated! Thanks for your help!

Edit:
Thought I couldn't edit the post, but it ended up just being my internet connection. Please disregard my comment below. Anyways, here is a method that I tried calling recursively:
protected function set_value( &$data, $value ) {
    foreach( $data as &$val ) {
        if( is_array( $val ) ) {
            $this->set_value( $val, $value );
        } else {
            $val = $value;
        }
    }
}
To start the loop off I did this:
$this->set_value( $data[$keys[0]], $value );

解决方案
You can try 
$data = array();
$keys = array(
        0 => 'should',
        1 => 'be',
        2 => 'int'
);

$value = 'yjd';



echo "<pre>";
setValue($data,$keys,$value);
print_r($data);
Output 
Array
(
    [should] => Array
        (
            [be] => Array
                (
                    [int] => yjd
                )

        )

)
Function Used 
function setValue(&$data, $path, $value) {
    $temp = &$data;
    foreach ( $path as $key ) {
        $temp = &$temp[$key];
    }
    $temp = $value;
    return $value ;
}


                        
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