这是我的 xml 文件,我试图使用 PHP simplexml_load_string() 函数类解析它,但它只打印</description>
标签和 xml 的其余部分不会返回
XML 文件:
<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dfpvideo="http://api.google.com/dfpvideo" xmlns:media="http://search.yahoo.com/mrss/" xmlns:ngc="http://xml.natgeotv.com/fields" xmlns:ngs="http://prod.ngs.org/ngs" xmlns:ngsDebug="http://prod.ngs.org/ngs-debug" xmlns:ngsTax="http://prod.ngs.org/taxonomy" xmlns:os="http://a9.com/-/spec/opensearch/1.1/" xmlns:pl="http://xml.theplatform.com/data/object" xmlns:pl1="http://access.auth.theplatform.com/data/Account/2388557369" xmlns:pl2="http://access.auth.theplatform.com/data/Account/2423130747" xmlns:pla="http://xml.theplatform.com/data/object/admin" xmlns:plfile="http://xml.theplatform.com/media/data/MediaFile" xmlns:pllist="http://xml.theplatform.com/data/list" xmlns:plmedia="http://xml.theplatform.com/media/data/Media" xmlns:plrelease="http://xml.theplatform.com/media/data/Release" xmlns:wpf="http://prod.ngs.org/wpf" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ytcp="http://www.youtube.com/schemas/cms/2.0" version="2.0">
<channel>
<title>NG Video</title>
<link>http://feed.theplatform.com/f/ngs/dCCn2isYZ9N9</link>
<description>NG Video</description>
<os:startIndex>1</os:startIndex>
<os:itemsPerPage>100</os:itemsPerPage>
<pllist:entryCount>1</pllist:entryCount>
<item>
<pl:id>http://data.media.theplatform.com/media/data/Media/97681476000</pl:id>
<guid isPermaLink="false">a4ad87f6-cbe4-4816-9580-b6679af0ea73</guid>
<title>NG Live!: Sheikh of the Arctic</title>
<description><p>Having completed more solo trips to the Poles than anyone else on the planet, Børge Ousland is sometimes surprised by who he runs into crossing the vast Arctic tundra.</p></description>
<author />
<media:keywords />
<media:restriction relationship="deny" type="country" />
<media:content channels="2" samplingrate="44.1" bitrate="535.928" medium="video" duration="175.031" expression="full" fileSize="11725511" framerate="29.97" type="video/mp4" height="346" isDefault="true" url="http://link.theplatform.com/s/ngs/ekLOLGt3bemU?feed=NG%20Video" width="616">
<media:hash algo="md5">0AF4AD25977BF50888075D3547F67173</media:hash>
<pl:added>Sun, 22 Dec 2013 02:41:46 GMT</pl:added>
<plfile:assetType>mpeg4</plfile:assetType>
</media:content>
<media:thumbnail expression="full" fileSize="79478" type="image/jpeg" height="556" isDefault="false" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_990x556_177596483623.jpg" width="990">
<media:hash algo="md5">60FFCE1C849440050CBCBD259EF2CE65</media:hash>
<pl:added>Sun, 02 Mar 2014 05:26:41 GMT</pl:added>
<plfile:assetType>Poster</plfile:assetType>
<plfile:assetType>MED</plfile:assetType>
</media:thumbnail>
<media:thumbnail expression="full" fileSize="209762" type="image/jpeg" height="720" isDefault="false" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720.jpg" width="1280">
<media:hash algo="md5">08AC83096DC5F7E48A7CDE4BFA23A27A</media:hash>
<pl:added>Sun, 02 Mar 2014 05:26:30 GMT</pl:added>
<plfile:assetType>Mezzanine Image</plfile:assetType>
</media:thumbnail>
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<pl:added>Sun, 02 Mar 2014 05:26:45 GMT</pl:added>
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</media:thumbnail>
<media:thumbnail expression="full" fileSize="23707" type="image/jpeg" height="270" isDefault="false" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_480x270_177598019578.jpg" width="480">
<media:hash algo="md5">73F78D0314E0CC15CDA5C36AAE4560AD</media:hash>
<pl:added>Sun, 02 Mar 2014 05:26:42 GMT</pl:added>
<plfile:assetType>Poster</plfile:assetType>
<plfile:assetType>X-SM</plfile:assetType>
</media:thumbnail>
<media:thumbnail expression="full" fileSize="83905" type="image/jpeg" height="576" isDefault="false" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_1024x576_177598019579.jpg" width="1024">
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<pl:added>Sun, 02 Mar 2014 05:26:43 GMT</pl:added>
<plfile:assetType>Poster</plfile:assetType>
<plfile:assetType>LG</plfile:assetType>
</media:thumbnail>
<media:thumbnail expression="full" fileSize="114846" type="image/jpeg" height="720" isDefault="false" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_1280x720_177598019580.jpg" width="1280">
<media:hash algo="md5">31BFBD1020B2277B7E6FDD353973F263</media:hash>
<pl:added>Sun, 02 Mar 2014 05:26:43 GMT</pl:added>
<plfile:assetType>Poster</plfile:assetType>
<plfile:assetType>X-LG</plfile:assetType>
</media:thumbnail>
<media:thumbnail expression="full" fileSize="37132" type="image/jpeg" height="360" isDefault="true" url="http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_640x360_177598019582.jpg" width="640">
<media:hash algo="md5">2654AFBE193785E29FF0533CF977A473</media:hash>
<pl:added>Sun, 02 Mar 2014 05:26:44 GMT</pl:added>
<plfile:assetType>Poster</plfile:assetType>
<plfile:assetType>SM</plfile:assetType>
</media:thumbnail>
<pubDate>Sat, 21 Dec 2013 06:56:49 GMT</pubDate>
<plmedia:defaultThumbnailUrl>http://pmdvod.nationalgeographic.com/NG_Video/997/323/67322_1_1280x720_640x360_177598019582.jpg</plmedia:defaultThumbnailUrl>
<plmedia:provider />
<pl1:youTubeInStreamStandard>true</pl1:youTubeInStreamStandard>
<pl1:youTubeInStreamTrueView>true</pl1:youTubeInStreamTrueView>
<pl1:youTubeInVideo>true</pl1:youTubeInVideo>
<pl1:youTubePublic>false</pl1:youTubePublic>
<ngs:clipTypeOld>none</ngs:clipTypeOld>
<ngs:contentCreationDate>Mon, 13 May 2013 19:03:22 GMT</ngs:contentCreationDate>
<ngs:network>NGS</ngs:network>
<ngs:redirectToExternal>never</ngs:redirectToExternal>
<ngs:requiresAuth>false</ngs:requiresAuth>
<ngs:series>{"updated_datetime":null,"creation_datetime":null,"is_active":false,"name":"National Geographic Live","translated_names":[],"synonyms":[],"uuid":null,"notes":null,"objectType":"org.ngs.video.Show","groups":[],"url":null}</ngs:series>
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<ngsTax:location>{"updated_datetime":"2014-04-03T19:09:42.570Z","is_active":true,"creation_datetime":"2013-11-28T20:27:32.077Z","parent":"http://taxonomy.nationalgeographic.com/api/v1/locations/eea9ad49-32fc-3a7c-bf15-cfeabdaa2fb7","geonames_uri":null,"url":"http://taxonomy.nationalgeographic.com/api/v1/locations/ff4e742f-46e6-3867-be8c-003a7af8f86c","dbpedia_uri":"http://dbpedia.org/page/Arctic","name":"Arctic","longitude":0.0,"hierarchy":"earth/arctic/","latitude":0.0,"uuid":"ff4e742f-46e6-3867-be8c-003a7af8f86c","notes":"","objectType":"org.ngs.taxonomy.GeoLocation","groups":["Place","region"],"english_name":null,"parentName":"Earth"}</ngsTax:location>
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<ngsTax:slug>ousland-sheikh-bonus-nglive</ngsTax:slug>
<ngsTax:subject>{"updated_datetime":"2014-06-04T15:56:21.047Z","definition":"","is_active":true,"creation_datetime":"2013-11-28T19:59:40.956Z","scope_note":"","synonyms":[null],"parent":"http://taxonomy.nationalgeographic.com/api/v1/subjects/83bf00d5-93bd-3cca-acc3-543652f06d52","url":"http://taxonomy.nationalgeographic.com/api/v1/subjects/58f9272e-f37b-3550-a228-a5ee119553ae","name":"Explorers","hierarchy":"exploration/explorers/","uuid":"58f9272e-f37b-3550-a228-a5ee119553ae","notes":"","objectType":"org.ngs.taxonomy.Subject","groups":["Subject"],"english_name":null,"parentName":"Exploration"}</ngsTax:subject>
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<ngsTax:title>NG Live!: Sheikh of the Arctic</ngsTax:title>
<wpf:allTaxonomyId>18160</wpf:allTaxonomyId>
<wpf:allTaxonomyId>1589</wpf:allTaxonomyId>
<wpf:allTaxonomyId>858</wpf:allTaxonomyId>
<wpf:altLinkedLegacyUrl />
<wpf:author />
<wpf:firstPublishedTime>Mon, 13 May 2013 19:11:17 GMT</wpf:firstPublishedTime>
<wpf:id>13615</wpf:id>
<wpf:lastPublishedTime>Mon, 03 Feb 2014 21:50:20 GMT</wpf:lastPublishedTime>
<wpf:lineupName>Nat Geo Live 2</wpf:lineupName>
<wpf:locationMigration>Arctic</wpf:locationMigration>
<wpf:locationMigration>Antarctica</wpf:locationMigration>
<wpf:metaKeyword>Nat Geo Live</wpf:metaKeyword>
<wpf:metaKeyword>Nat Geo Live!</wpf:metaKeyword>
<wpf:metaKeyword>lecture</wpf:metaKeyword>
<wpf:metaKeyword>National Geographic Live</wpf:metaKeyword>
<wpf:metaKeyword>National Geographic Live!</wpf:metaKeyword>
<wpf:metaKeyword>NGLive</wpf:metaKeyword>
<wpf:metaKeyword>NG Live</wpf:metaKeyword>
<wpf:metaKeyword>Nat Geo Events</wpf:metaKeyword>
<wpf:metaKeyword>Børge Ousland</wpf:metaKeyword>
<wpf:metaKeyword>polar</wpf:metaKeyword>
<wpf:metaKeyword>adventure</wpf:metaKeyword>
<wpf:metaKeyword>explore</wpf:metaKeyword>
<wpf:metaKeyword>exploration</wpf:metaKeyword>
<wpf:metaKeyword>expedition</wpf:metaKeyword>
<wpf:metaKeyword>ski</wpf:metaKeyword>
<wpf:metaKeyword>North Pole</wpf:metaKeyword>
<wpf:metaKeyword>loneliness</wpf:metaKeyword>
<wpf:metaKeyword>strange</wpf:metaKeyword>
<wpf:metaKeyword>visitor</wpf:metaKeyword>
<wpf:metaKeyword>ice</wpf:metaKeyword>
<wpf:metaKeyword>photo</wpf:metaKeyword>
<wpf:metaKeywords>Nat Geo Live, Nat Geo Live!, lecture, National Geographic Live, National Geographic Live!, NGLive, NG Live, Nat Geo Events, Børge Ousland, polar, adventure, explore, exploration, expedition, ski, North Pole, loneliness, strange, visitor, ice, photo</wpf:metaKeywords>
<wpf:organizationMigration>National Geographic Live</wpf:organizationMigration>
<wpf:sitePath>Specials Video::Nat Geo Live::Nat Geo Live 2</wpf:sitePath>
<wpf:siteUrlPath>/video/specials/nat-geo-live-specials/nat-geo-live-2/ousland-sheikh-bonus-nglive/</wpf:siteUrlPath>
<wpf:subjectMigration>Explorers</wpf:subjectMigration>
<wpf:subjectMigration>Expeditions</wpf:subjectMigration>
<wpf:subjectMigration>Travel</wpf:subjectMigration>
<wpf:taxonomyId>18160</wpf:taxonomyId>
<ytcp:youTubeAssetType>web</ytcp:youTubeAssetType>
<ytcp:youTubeSavedMatchRights>Monetize in all countries</ytcp:youTubeSavedMatchRights>
<ytcp:youTubeSavedUsageRights>Monetize in all countries</ytcp:youTubeSavedUsageRights>
</item>
</channel>
</rss>
这是我的代码
function parsexml($xml)
{
$xmlparse=simplexml_load_string($xml)
var_dump($xmlparse);
}