跪求大侠帮助 php获取xml节点数据的小疑点

跪求大侠帮助 php获取xml节点数据的小问题
小弟太菜了，我想获取=express,=530000时的的值,那位大哥给写个详细的代码啊?

数据代码如下:


 
  8.0
  22.0
  3.0
  8.0
  快递
  41864647
 
 
  440000
  181030917
  3.0
  10.0
  ems
 
  130000,360000,500000,460000,370000,530000,520000,340000,510000,420000,450000,410000,110000,120000,430000,350000
  181030918
  5.0
  15.0
  express
 
 
 


------解决方案--------------------
页面并没有看到=530000的标签。。以下只是输出全部结构。你自己遍历判断一下就可以得到结果。。

PHP code

$xml=
<postage_get_response>
  <postage>
  <ems_increase>8.0</ems_increase>
  <ems_price>22.0</ems_price>
  <express_increase>3.0</express_increase>
  <express_price>8.0</express_price>
  <name>快递</name>
  <postage_id>41864647</postage_id>
  <postage_modes list="true">
  <postage_mode>
  <dests>440000</dests>
  <id>181030917</id>
  <increase>3.0</increase>
  <price>10.0</price>
  <type>ems</type>
  </postage_mode>
  <postage_mode> <dests>130000,360000,500000,460000,370000,530000,520000,340000,510000,420000,450000,410000,110000,120000,430000,350000</dests>
  <id>181030918</id>
  <increase>5.0</increase>
  <price>15.0</price>
  <type>express</type>
  </postage_mode>
  </postage_modes>
  </postage>
</postage_get_response>
xml;
$con=simplexml_load_string($xml);
print_r($con); <div class="clear">
                 
              
              
        
            </div>