- simplexml_load_string: documentation ( source)
<?php
$x = <<<XML
<MembershipCardLists>
<MembershipCardInfo>
<CardNo>8898990000000083</CardNo>
</MembershipCardInfo>
<MembershipCardInfo>
<CardNo>8898000000000260</CardNo>
</MembershipCardInfo>
</MembershipCardLists>
XML;
$xml = simplexml_load_string($x);
echo $xml->MembershipCardInfo[0]->CardNo;;