将 XML 数据读取到 php

我有一个xml文件，它有一组记录，我想将这些记录加载到php中我正在尝试将这些值传递给php，但我的代码不起作用.任何人都可以告诉我如何将这些xml数据解析为php

这是我的 xml 数据：

 <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
- <report>
  <report-name name="Criteria performance report #54afd4b9c3fd9" /> 
  <date-range date="Dec 1, 2014-Dec 31, 2014" /> 
- <table>
- <columns>
  <column name="day" display="Day" /> 
  <column name="adGroupID" display="Ad group ID" /> 
  <column name="adGroup" display="Ad group" /> 
  <column name="ad" display="Ad" /> 
  <column name="descriptionLine1" display="Description line 1" /> 
  <column name="descriptionLine2" display="Description line 2" /> 
  <column name="displayURL" display="Display URL" /> 
  <column name="clicks" display="Clicks" /> 
  <column name="convertedClicks" display="Converted clicks" /> 
  <column name="cost" display="Cost" /> 
  <column name="ctr" display="CTR" /> 
  </columns>
  <row day="2014-12-01" adGroupID="16385367652" adGroup="Urology" ad="Best Urology Treatment" descriptionLine1="Get treated in top urology hospital" descriptionLine2="Take a free advice from our experts" displayURL="www.ainuindia.com" clicks="0" convertedClicks="0" cost="0" ctr="0.00%" /> 
  <row day="2014-12-01" adGroupID="16282238572" adGroup="Kidney Stones Removal" ad="Kidney Stone Removal" descriptionLine1="Get treated at top kidney center" descriptionLine2="Take a free advice from our experts" displayURL="www.ainuindia.com" clicks="0" convertedClicks="0" cost="0" ctr="0.00%" /> 
  <row day="2014-12-01" adGroupID="16282238572" adGroup="Kidney Stones Removal" ad="Kidney Stone Removal" descriptionLine1="Get treated at top kidney center" descriptionLine2="Take a free advice from our experts" displayURL="www.ainuindia.com" clicks="0" convertedClicks="0" cost="0" ctr="0.00%" /> 
</table>
 </report>

我的 php 代码是：

if( ! $xml = simplexml_load_file(dirname(__FILE__) . '/report.xml') )
    {
        echo 'unable to load XML file';
    }
    else
    {
        foreach( $xml as $table )
        {
            echo 'Adgroup id: '.$table->columns->adGroupID.'<br />';
            echo 'group: '.$table->columns->adGroup.'<br />';
            echo 'Ad: '.$table->columns->ad.'<br />';
            echo 'Description1: '.  $table->columns->descriptionLine1.'<br />';
            echo 'Description2: '.$table->columns->descriptionLine2.'<br />';
        }
    }