PHP的通话从字符串数组 [英] php call array from string

问题描述

我有一个包含数组元素的字符串。

I have a string that contains elements from array.

$str = '[some][string]';
$array = array();

我如何获得 $数组的值['一些'] ['字符串'] 使用 $ STR ？

推荐答案

您可以通过使用eval这样做，不知道你舒服：

You can do so by using eval, don't know if your comfortable with it:

$array['some']['string'] = 'test';    
$str = '[some][string]';    
$code = sprintf('return $array%s;', str_replace(array('[',']'), array('[\'', '\']'), $str));    
$value = eval($code);    
echo $value; # test

不过EVAL并不总是正确的工具，因为还有，它表明最常你有一个设计缺陷，当你需要使用它。

However eval is not always the right tool because well, it shows most often that you have a design flaw when you need to use it.

另外一个例子，如果你需要写访问阵列项目，您可以执行以下操作：

Another example if you need to write access to the array item, you can do the following:

$array['some']['string'] = 'test';
$str = '[some][string]';
$path = explode('][', substr($str, 1, -1));
$value = &$array;
foreach($path as $segment)
{
    $value = &$value[$segment];
}

echo $value;
$value = 'changed';
print_r($array);

这实际上是相同的原则，在 Eric的答案，但引用变量。

This is actually the same principle as in Eric's answer but referencing the variable.

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