基本Songkick API XML解析與循環

Question

我試圖解析Songkick API成藝術家即將到來的演出日期列表。從我所能找到的，以下應該做到這一點。問題是，它不起作用。

該代碼完全沒有返回。

$artist_id = "id"; 
$api_key = "API key"; 

$request_url = urlencode("http://api.songkick.com/api/3.0/artists/" . $artist_id . "/calendar.xml?apikey=" . $api_key); 
$load_api   = simplexml_load_file($request_url) or die("Songkick API error."); 

foreach ($load_api->event as $shows) { 
     $venue  = $shows->venue["displayName"]; 
     $city  = $shows->location["city"]; 
     $skdate = $shows->start["date"]; 
          $date = date("M d", strtotime($skdate)); 
     $artists = $shows->event->performance->artist["displayName"]; 

     echo $shows; 
     echo $city; 
     echo $date; 
     echo $artists; 

XML文件看起來像下面的幾個實例：

<event type="Concert" status="ok" displayName="Band with supporting acts" popularity="0.000495" uri="songkick address for this show" id="248"> 
     <metroArea displayName="SF Bay Area" uri="songkick address for this metro area" id="26330"> 
      <state displayName="CA"/> 
      <country displayName="US"/> 
     </metroArea> 
    </venue> 
    <start time="21:30:00" datetime="2013-05-31T21:30:00-0800" date="2013-05-31"/> 
    <location lat="37.7650545" lng="-122.3963593" city="San Francisco, CA, US"/> 
    <performance billingIndex="1" displayName="headliner" billing="headline" id="31239239"> 
     <artist displayName="Band Name" uri="uri for headling band" id="4114066"/> 
    </performance> 
    <performance billingIndex="2" displayName="Opener 1" billing="support" id="31239244"> 
     <artist displayName="Opener 1" uri="Opener 1 uri to songkick band page" id="4852118"/> 
    </performance> 
    <performance billingIndex="3" displayName="Opener 2" billing="support" id="31239249"> 
     <artist displayName="Opener 2" uri="Opener 2 uri to songkick band page" id="3527036"/> 
    </performance> 
</event> 

任何意見，將不勝感激......我不知所措。

謝謝！

---

更新：想通了！謝謝！

<?php 
    $artist_id = "*songkick artist id*"; 
    $api_key = "*api key*"; 
    $perm_link = "http://www.songkick.com/artists/$artist_id"; 

    $request_url = "http://api.songkick.com/api/3.0/artists/" . $artist_id . "/calendar.xml?apikey=" . $api_key; 
    $xml   = simplexml_load_file($request_url) or die("Songkick API error. Click <a href=\"" . $perm_link . "\" target=\"_blank\">Click here for show dates</a>."); // load file, or if error, print direct link to songkick page 

    foreach ($xml->results->event as $event) { 
     $skdate  = $event->start["date"]; 
      $date = date("M d", strtotime($skdate)); 
     $venue  = $event->venue["displayName"]; 
     $city  = $event->location["city"]; 
     $artists = $event->xpath("./performance/artist/@displayName"); 

     echo $venue, $city, $date . ":<br />" . implode(', ',$artists) . "<br />"; 
    } 

?> 

Answer 1

瞭解調試代碼：

1. 你上面的XML是無效的 - >http://www.xmlvalidation.com
2. 確保$load_api包含了什麼你認爲它通過使用var_dump($load_api);
3. 確保PHP的錯誤報告處於最佳狀態，搜索SO如何做到這一點。
4. 您的XML有多個<artist>節點，所以$artists必須設置不同。

5. 你echo $shows這是回聲 - 沒有，因爲它有孩子，但沒有價值。

   $xml = simplexml_load_string($x); // assume **valid** XML in $x 
   
   foreach ($xml->event as $shows) { 
       $venue = $shows->venue["displayName"]; 
       $city = $shows->location["city"]; 
       $date = date("M d", strtotime($shows->start["date"])); 
       $artists = $shows->xpath("//artist/@displayName"); // returns array! 
   
       echo "$city $date: " . implode(', ',$artists) . "<br />"; 
   } 
   

看到它的工作：http://codepad.viper-7.com/yrAjYI