解析XML结果中的数组

Question

我无法理解使用SimpleXMLElement打印数组结果的正确语法。从我的XML结果中，我必须要求用户将自己与数组中找到的其中一个人进行匹配，但我不确定什么是最好的方式来做到这一点。

示例XML结果：

[authentication] => SimpleXMLElement Object 
    (
     [age] => SimpleXMLElement Object 
      (
       [code] => 5 
       [ambiguous] => SimpleXMLElement Object 
        (
         [person] => Array 
          (
           [0] => SimpleXMLElement Object 
            (
             [name] => Paul Foreman 
             [question] => SimpleXMLElement Object 
              (
               [id] => dcalc3 
               [prompt] => What+do+the+%3Cb%3Elast+four%3C%2Fb%3E+digits+of+your+Social+Security+Number+add+up+to%3F 
               [answer] => 5 
              ) 

            ) 

           [1] => SimpleXMLElement Object 
            (
             [name] => Paul Foreman 
             [question] => SimpleXMLElement Object 
              (
               [id] => dcalc3 
               [prompt] => What+do+the+%3Cb%3Elast+four%3C%2Fb%3E+digits+of+your+Social+Security+Number+add+up+to%3F 
               [answer] => 6 
              ) 

            ) 

          ) 

        ) 

      ) 

    ) 

解决方案即时寻找：

<?php 
$string = $xml_result; 

$xml = new SimpleXMLElement($string); 

$is_age_code = $xml->authentication->{'age'}->code; 

if($x_is_age_code == '5'){ 
// code 5 means more than one match found 
    // Ask user verification question 
     // If answer matches question 
       // Set current user as that person 
} 
?> 

我如何找出有多少“人”是在数组中，并与多家识别他们？

Answer 1

要计算的人数使用：

echo count($xml->authentication->age->ambiguous->person); 

要访问一个人的子节点使用

echo $xml->authentication->age->ambiguous->person[0]->question->prompt; 

或一个循环：

foreach ($xml->authentication->age->ambiguous->person as $person) { 
    echo $person->question->prompt; 
}