如何從SimpleXml對象中獲取值

Question

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))) 
), 

如何獲取計劃的值，金額來自這些，任何人都可以幫助我？

Answer 1

通過的XPath

http://php.net/manual/en/simplexmlelement.xpath.php