Php 如何从SimpleXml对象获取值

如何获得计划的价值，从中获得的金额，有人能帮我吗

通过XPath

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在建议的xpath旁边，手册中有一些基本示例，这些示例对于理解simplexml的工作原理非常有帮助。

SimpleXMLElement Object ( 
  [results] => 2 
  [total_results] => 2 
  [plans] => SimpleXMLElement Object ( [plan] => Array ( [0] => SimpleXMLElement Object ( [id] => 1014 [type] => paid [name] => Silver [amount] => 1000.00 [interval] => 30 [notification_url] => http://www.google.com [free_trial] => 0 [occurrences] => 1 [num_customers] => 0 [status] => active ) [1] => SimpleXMLElement Object ( [id] => 1013 [type] => paid [name] => Gold [amount] => 500.00 [interval] => 30 [notification_url] => http://www.movebyu.com/ExpressEngine/index.php/?ACT=21 [free_trial] => 0 [occurrences] => 1 [num_customers] => 1 [status] => active ) ) ) 
),