i need php script to extract the ip address from the following xml page www.ip-address.com/test.xml

```
<dnstools>
<service_provider>Domain Tools</service_provider>
<provider_url>http://www.domaintools.com/</provider_url>
<date>Wed, 12 May 2010 00:43:07 GMT</date>
<unix_time>1273624987</unix_time>
<ip_address>94.252.157.241</ip_address>
<hostname>94.252.157.241</hostname>
<blacklist_status>Clear</blacklist_status>
<remote_port>43577</remote_port>
<protocol>HTTP/1.0</protocol>
<connection>keep-alive</connection>
<keep_alive/>

```