递归获取数组的键并创建下划线分隔的字符串

问题描述：

现在，我得到了一个包含某种信息的数组，我需要从中创建一个表.例如

Right now i got an array which has some sort of information and i need to create a table from it. e.g.

Student{
      [Address]{
              [StreetAddress] =>"Some Street"
              [StreetName] => "Some Name"
      }
      [Marks1] => 100
      [Marks2] => 50
    }

现在，我想创建数据库表，其中包含字段名称为:

Now I want to create database table like which contain the fields name as :

Student_Address_StreetAddress
Student_Address_StreetName
Student_Marks1
Student_Marks2

它应该是递归的，以便从数组的任何深度可以创建我格式的字符串.

It should be recursive so from any depth of array it can create the string in my format.

答

您可以使用 RecursiveArrayIterator 和 SPL )，以使这项工作相对轻松.

You can use the RecursiveArrayIterator and the RecursiveIteratorIterator (to iterate over the array recursively) from the Standard PHP Library (SPL) to make this job relatively painless.

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
$keys = array();
foreach ($iterator as $key => $value) {
    // Build long key name based on parent keys
    for ($i = $iterator->getDepth() - 1; $i >= 0; $i--) {
        $key = $iterator->getSubIterator($i)->key() . '_' . $key;
    }
    $keys[] = $key;
}
var_export($keys);

上面的示例输出如下内容:

The above example outputs something like:

array (
  0 => 'Student_Address_StreetAddress',
  1 => 'Student_Address_StreetName',
  2 => 'Student_Marks1',
  3 => 'Student_Marks2',
)

递归获取数组的键并创建下划线分隔的字符串

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