<?php
$xml ="1.xml";
$dom = new DOMDocument();
$dom->load($xml);
$root = $dom->documentElement;
$arr=array();
foreach ($root->childNodes as $item)
{
 if($item->hasChildNodes()){

$tmp=array();
 foreach($item->childNodes as $one){
  if(!empty($one->tagName)){
  $tmp[$one->tagName]=$one->nodeValue;
  }
 }
 $arr[$item->tagName]=$tmp;
 }
}
print_r($arr);

<all>
<杭州>
  <拼车顺风车>http%3A%2F%2Fhz.fenlei168.com%2Fpinche%2F</拼车顺风车>
  <四S店经销商>http%3A%2F%2Fhz.fenlei168.com%2Fssss%2F</四S店经销商>
  <二手汽车>http%3A%2F%2Fhz.fenlei168.com%2Fershouche%2F</二手汽车>
  <汽车配件>http%3A%2F%2Fhz.fenlei168.com%2Fqipeijian%2F</汽车配件>
  <租车代驾陪练>http%3A%2F%2Fhz.fenlei168.com%2Fdaijia%2F</租车代驾陪练>
  <汽车服务过户>http%3A%2F%2Fhz.fenlei168.com%2Fqicheguohu%2F</汽车服务过户>
  <二手摩托车>http%3A%2F%2Fhz.fenlei168.com%2Fershoumotuo%2F</二手摩托车>
  <自行车电动车>http%3A%2F%2Fhz.fenlei168.com%2Fzixingche%2F</自行车电动车>
  <其它车辆信息>http%3A%2F%2Fhz.fenlei168.com%2Fqitache%2F</其它车辆信息>
</杭州>
<武汉>
  <拼车顺风车>http%3A%2F%2Fwh.fenlei168.com%2Fpinche%2F</拼车顺风车>
  <四S店经销商>http%3A%2F%2Fwh.fenlei168.com%2Fssss%2F</四S店经销商>
  <二手汽车>http%3A%2F%2Fwh.fenlei168.com%2Fershouche%2F</二手汽车>
  <汽车配件>http%3A%2F%2Fwh.fenlei168.com%2Fqipeijian%2F</汽车配件>
  <租车代驾陪练>http%3A%2F%2Fwh.fenlei168.com%2Fdaijia%2F</租车代驾陪练>
  <汽车服务过户>http%3A%2F%2Fwh.fenlei168.com%2Fqicheguohu%2F</汽车服务过户>
  <二手摩托车>http%3A%2F%2Fwh.fenlei168.com%2Fershoumotuo%2F</二手摩托车>
  <自行车电动车>http%3A%2F%2Fwh.fenlei168.com%2Fzixingche%2F</自行车电动车>
  <其它车辆信息>http%3A%2F%2Fwh.fenlei168.com%2Fqitache%2F</其它车辆信息>
</武汉>
</all>