如何使用字符串获取PHP中关联HTML数组的值? [英] How to get value of an associative HTML array in PHP using a string?

问题描述

看我有这样的表格:

<form method="post">
    <input name="variable[var1][var2]" value="44"/>
</form>

我想使用类似这样的字符串来获取PHP中variable[var1][var2]的值:

I want to get the value of variable[var1][var2] in PHP using a string like:

$str = "['variable']['var1']['var2']";
echo "{$_POST{$str}}";

为什么我需要这样做?

我需要它，因为获取该值的代码是完全动态的，并且我无法使用$_POST['variable']['var1']['var2']手动获取或设置该值.

I need it because the code that gets the value is totally dynamic and I cannot get or set manually the value using $_POST['variable']['var1']['var2'].

你能帮忙吗?

注意:我知道可以使用$_POST['variable']['var1']['var2']来获得它，请不要问我为什么不使用这种方式.我只需要使用上述方法(使用$str).

NOTE: I know this is possible to get it using $_POST['variable']['var1']['var2'], please don't ask me about why I'm not using this way. Simply I need to use as above (using $str).

推荐答案

您可以使用preg_match_all()将字符串中的所有索引放入数组:

You can use preg_match_all() to get all the indexes in the string into an array:

$indexes = preg_match_all('/(?<=\[\')(?:[^\']*)(?=\'\])/', $str);
$indexes = $indexes[0]; // Get just the whole matches

然后使用循环钻入$_POST.

$cur = $_POST;
foreach ($indexes as $index) {
    $cur = $cur[$index];
}

此时$cur将包含您想要的值.

At this point $cur will contain the value you want.

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