使用PHP解析iTunes RSS Atom源？

Question

使用PHP解析iTunes RSS Atom源？

4

尝试使用PHP脚本解析iTunes Atom feed。如果您访问iTunes RSS Generator，您可以生成像这样的Atom feed：

http://itunes.apple.com/us/rss/topsongs/limit=10/genre=16/explicit=true/xml

这将给出类似以下的iTunes RSS feed结果：

<?xml version="1.0" encoding="utf-8"?>
<feed xmlns:im="http://itunes.apple.com/rss" xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
    <id>http://itunes.apple.com/us/rss/topsongs/limit=10/genre=16/explicit=true/xml</id><title>iTunes Store: Top Songs in Soundtrack</title><updated>2012-04-01T07:22:41-07:00</updated><link rel="alternate" type="text/html" href="http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewTop?id=17&amp;popId=1"/><link rel="self" href="http://itunes.apple.com/us/rss/topsongs/limit=10/genre=16/explicit=true/xml"/><icon>http://phobos.apple.com/favicon.ico</icon><author><name>iTunes Store</name><uri>http://www.apple.com/itunes/</uri></author><rights>Copyright 2008 Apple Inc.</rights>
        <entry>
            <updated>2012-04-01T07:22:41-07:00</updated>
                <id im:id="509605055">http://itunes.apple.com/us/album/eyes-open/id509605019?i=509605055&amp;uo=2</id>
                <title>Eyes Open - Taylor Swift</title>
                <im:name>Eyes Open</im:name>
                <link rel="alternate" type="text/html" href="http://itunes.apple.com/us/album/eyes-open/id509605019?i=509605055&amp;uo=2"/>
                <im:contentType term="Music" label="Music"><im:contentType term="Track" label="Track"/></im:contentType>
                <category term="Soundtrack" scheme="http://itunes.apple.com/us/genre/music-soundtrack/id16?uo=2" label="Soundtrack"/>

                <link title="Preview" rel="enclosure" type="audio/x-m4a" href="http://a2.mzstatic.com/us/r1000/116/Music/88/70/a6/mzi.gcauwkkw.aac.p.m4a" im:assetType="preview"><im:duration>30000</im:duration></link>

                <im:artist href="http://itunes.apple.com/us/artist/taylor-swift/id159260351?uo=2">Taylor Swift</im:artist>
                <im:price amount="1.29000" currency="USD">$1.29</im:price>
                <im:image height="55">http://a3.mzstatic.com/us/r1000/069/Music/v4/15/59/19/15591949-a525-99e8-0c50-45697b0ec78b/UMG_cvrart_00602527969206_01_RGB72_1200x1200_12UMGIM10247.55x55-70.jpg</im:image>
                <im:image height="60">http://a5.mzstatic.com/us/r1000/069/Music/v4/15/59/19/15591949-a525-99e8-0c50-45697b0ec78b/UMG_cvrart_00602527969206_01_RGB72_1200x1200_12UMGIM10247.60x60-50.jpg</im:image>
                <im:image height="170">http://a3.mzstatic.com/us/r1000/069/Music/v4/15/59/19/15591949-a525-99e8-0c50-45697b0ec78b/UMG_cvrart_00602527969206_01_RGB72_1200x1200_12UMGIM10247.170x170-75.jpg</im:image>
                <rights>2012 Universal Republic Records, a division of UMG Recordings, Inc.</rights>
                <im:releaseDate label="March 20, 2012">2012-03-20T00:00:00-07:00</im:releaseDate>
                <im:collection><im:name>The Hunger Games (Songs from District 12 and Beyond)</im:name><link rel="alternate" type="text/html" href="http://itunes.apple.com/us/album/hunger-games-songs-from-district/id509605019?uo=2"/><im:contentType term="Music" label="Music"><im:contentType term="Album" label="Album"/></im:contentType></im:collection>

(etc...)

使用PHP脚本，我能够得到每个[entry]的、<id>、<im:image>等结果，以用于脚本输出。我需要获取其中一个<link>条目的URL。特别是我需要从“预览”链接中获取URL：</br><div class="h-2"></div><pre class="guess-Ini"><code><link title="Preview" rel="enclosure" type="audio/x-m4a" href="http://a2.mzstatic.com/us/r1000/116/Music/88/70/a6/mzi.gcauwkkw.aac.p.m4a" im:assetType="preview"><im:duration>30000</im:duration></link> </code></pre></br><div class="h-2"></div>在这种情况下，我们需要使用<em>a2.mzstatic.com/us/r1000/116/Music/88/70/a6/mzi.gcauwkkw.aac.p.m4a</em>链接，用于每个10个条目的脚本结果。</br><div class="h-2"></div>如何捕获上述Atom feed中.m4a音频文件“预览”链接的href？</br><div class="h-2"></div>以下是PHP脚本的一部分，我们在其中获取iTunes Atom url的内容，通过<em>$rssresults</em>循环遍历10个结果，并为每个条目生成HTML，该HTML在站点模板中被调用。</br><div class="h-2"></div><pre class="guess-PowerShell"><code> $string = file_get_contents('http://itunes.apple.com/us/rss/topsongs/limit=10/genre=16/explicit=true/xml'); // Remove the colon ":" in the <xxx:yyy> to be <xxxyyy> $string = preg_replace("/(<\/?)(\w+):([^>]*>)/", "$1$2$3", $string); if ($f = @fopen($cache_file, 'w')) { fwrite ($f, $string, strlen($string)); fclose($f); } } $xml = simplexml_load_string($string); // Output $rssresults = ''; $count = 1; $max = 11; foreach ($xml->entry as $val) { if ($count < $max) { $rssresults .= ' <a href="'.$val->id.'" title="'.$val->title.'"><img src="'.$val->imimage[2].'" alt="'.$val->title.'"></a> // .m4a preview url? <div><a href=" ">Preview</div> <div><strong>'.$count.'. <a href="'.$val->id.'" title="'.$val->title.'">'.$val->title.'</a></strong></div> <div> from '.$val->imcollection->imname.'</div>; } $count++; } </code></pre></br><div class="h-2"></div>任何想法如何为每个条目添加“.m4a预览URL”的上述脚本？感谢任何帮助。

- jca

1个回答

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- Shiplu Mokaddim · Accepted Answer

在您的foreach循环中，尝试使用$val->link[1]["href"]来获取URL。

foreach ($xml->entry as $val) {
    // echo the link of Preview
    echo $val->link[1]["href"];
}

说明：
由于有多个link条目，您可以通过数组索引来访问它们。所以索引1用于访问第二个link条目。可以通过元素的名称作为键来访问元素的每个属性。因此，$val->link[1]["href"]将给您http://a2.mzstatic.com/us/r1000/116/Music/88/70/a6/mzi.gcauwkkw.aac.p.m4a。

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