从 XML 文件接收特定值
Receive specific values from XML file
我有以下 XML 的片段：
<?xml version="1.0" encoding="UTF-8"?>
<searchRetrieveResponse xmlns="http://www.loc.gov/zing/srw/">
<version>1.1</version>
<numberOfRecords>1</numberOfRecords>
<records>
<record>
<recordSchema>MARC21-xml</recordSchema>
<recordPacking>xml</recordPacking>
<recordData>
<record xmlns="http://www.loc.gov/MARC21/slim" type="Authority">
<leader>00000nz a2200000nc 4500</leader>
<controlfield tag="001">040432386</controlfield>
<controlfield tag="003">DE-101</controlfield>
<controlfield tag="005">20180124053847.0</controlfield>
<controlfield tag="008">880701n||azznnbabn | ana |c</controlfield>
<datafield tag="024" ind1="7" ind2=" ">
<subfield code="a">http://d-nb.info/gnd/4043238-5</subfield>
<subfield code="2">uri</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="a">(DE-101)040432386</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="a">(DE-588)4043238-5</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="z">(DE-588c)4043238-5</subfield>
<subfield code="9">v:zg</subfield>
</datafield>
<datafield tag="040" ind1=" " ind2=" ">
<subfield code="a">DE-101</subfield>
<subfield code="9">r:DE-101</subfield>
<subfield code="b">ger</subfield>
<subfield code="d">9999</subfield>
</datafield>
<datafield tag="042" ind1=" " ind2=" ">
<subfield code="a">gnd1</subfield>
</datafield>
<datafield tag="065" ind1=" " ind2=" ">
<subfield code="a">13.3</subfield>
<subfield code="2">sswd</subfield>
</datafield>
<datafield tag="075" ind1=" " ind2=" ">
<subfield code="b">s</subfield>
<subfield code="2">gndgen</subfield>
</datafield>
<datafield tag="075" ind1=" " ind2=" ">
<subfield code="b">saz</subfield>
<subfield code="2">gndspec</subfield>
</datafield>
<datafield tag="079" ind1=" " ind2=" ">
<subfield code="a">g</subfield>
<subfield code="q">s</subfield>
<subfield code="u">w</subfield>
<subfield code="u">o</subfield>
<subfield code="u">z</subfield>
</datafield>
<datafield tag="083" ind1="0" ind2="4">
<subfield code="a">751.45</subfield>
<subfield code="9">d:3</subfield>
<subfield code="9">t:2007-01-01</subfield>
<subfield code="2">22/ger</subfield>
</datafield>
<datafield tag="150" ind1=" " ind2=" ">
<subfield code="a">Ölmalerei</subfield>
</datafield>
<datafield tag="450" ind1=" " ind2=" ">
<subfield code="a">Ölgemälde</subfield>
</datafield>
<datafield tag="550" ind1=" " ind2=" ">
<subfield code="0">(DE-101)040372200</subfield>
<subfield code="0">(DE-588)4037220-0</subfield>
<subfield code="0">http://d-nb.info/gnd/4037220-0</subfield>
<subfield code="a">Malerei</subfield>
<subfield code="4">obal</subfield>
<subfield code="4">http://d-nb.info/standards/elementset/gnd#broaderTermGeneral</subfield>
<subfield code="w">r</subfield>
<subfield code="i">Oberbegriff allgemein</subfield>
</datafield>
<datafield tag="670" ind1=" " ind2=" ">
<subfield code="a">M</subfield>
</datafield>
<datafield tag="677" ind1=" " ind2=" ">
<subfield code="a">Wird i.d.R. nur verwendet, wenn die Maltechnik behandelt ist.</subfield>
</datafield>
<datafield tag="750" ind1=" " ind2="7">
<subfield code="a">Peinture à l'huile</subfield>
<subfield code="0">(FrPBN)FRBNF119329441</subfield>
<subfield code="0">http://data.bnf.fr/11932944</subfield>
<subfield code="2">ram</subfield>
<subfield code="9">v:MACS-Mapping. Bitte keine Änderungen vornehmen.</subfield>
</datafield>
<datafield tag="913" ind1=" " ind2=" ">
<subfield code="S">swd</subfield>
<subfield code="i">s</subfield>
<subfield code="a">Ölmalerei</subfield>
<subfield code="0">(DE-588c)4043238-5</subfield>
</datafield>
</record>
</recordData>
<recordPosition>1</recordPosition>
</record>
</records>
<nextRecordPosition>2</nextRecordPosition>
<echoedSearchRetrieveRequest>
<version>1.1</version>
<query>WOE=4043238-5 and COD=s</query>
<xQuery xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true" />
<recordSchema>MARC21-xml</recordSchema>
</echoedSearchRetrieveRequest>
<extraResponseData>
<accountOf xmlns="">Staatsbibliothek zu Berlin - Preußischer Kulturbesitz, bpk-Bildagentur</accountOf>
</extraResponseData>
</searchRetrieveResponse>
当我 运行 下面的 php 代码时，我只得到一个空白页。哪个代码缺少访问例如 datafield 与 tag 150 和相应的 subfield？我错过了什么？
php代码：
header('Content-type: text/html; charset=utf-8');
error_reporting(E_ALL);
$id = $_POST["id"];
// URL to fetch
$url = "https://services.dnb.de/sru/authorities?version=1.1&operation=searchRetrieve&query=WOE%3D$id%20and%20COD%3Ds&recordSchema=MARC21-xml";
// Setting the HTTP Request Headers
$User_Agent = 'Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Firefox/60.0';
$request_headers = array('Contect-Type:text/xml', 'Accept:text/xml');
$ch = curl_init($url);
// Set the url
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt($ch, CURLOPT_USERAGENT, $User_Agent);
curl_setopt($ch, CURLOPT_HTTPHEADER, $request_headers);
curl_setopt($ch, CURLOPT_ENCODING, "");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Execute
$result = curl_exec($ch); // Performs the Request, with specified curl_setopt() options (if any).
// Closing
curl_close($ch);
$xml = SimpleXMLElement($result) or die("Error: Cannot create object");
echo($xml);
我环顾四周，发现它可能与将它传递给字符串有关，但后来我在屏幕上什么也看不到。甚至 SimpleXMLElement 对象。
感谢您的帮助
SimpleXMLElement 是一个 class 名称，不是函数。尝试用 new:
实例化它
$xml = new SimpleXMLElement($result);
或使用 simplexml_load_string。
$xml = simplexml_load_string($result);
此外，您使用所有 curl 代码使事情过于复杂。这应该同样有效：
// ALWAYS sanitize user-submitted data
// in this example everything except numbers and hyphens are removed
$id = preg_replace("/[^0-9-]/", "", $_POST["id"]);
$url = "https://services.dnb.de/sru/authorities?version=1.1&operation=searchRetrieve&query=WOE%3D$id%20and%20COD%3Ds&recordSchema=MARC21-xml";
$xml = new SimpleXMLElement($url, 0, true);
评论和其他答案涵盖了您未获得任何输出的原因。这是因为缺少 new 关键字。这将向您展示如何获取结果对象并对其进行解析以获取所需的子字段。这只是转储子字段对象，但您可以从这里用它做任何您想做的事。
$xmlObj = new SimpleXMLElement($xml);
foreach($xmlObj->records->record->recordData->record->datafield as $dfield)
{
if((string)$dfield["tag"] == "150")
{
$subfield = $dfield->subfield;
var_dump($subfield);
}
}
我有以下 XML 的片段：
<?xml version="1.0" encoding="UTF-8"?>
<searchRetrieveResponse xmlns="http://www.loc.gov/zing/srw/">
<version>1.1</version>
<numberOfRecords>1</numberOfRecords>
<records>
<record>
<recordSchema>MARC21-xml</recordSchema>
<recordPacking>xml</recordPacking>
<recordData>
<record xmlns="http://www.loc.gov/MARC21/slim" type="Authority">
<leader>00000nz a2200000nc 4500</leader>
<controlfield tag="001">040432386</controlfield>
<controlfield tag="003">DE-101</controlfield>
<controlfield tag="005">20180124053847.0</controlfield>
<controlfield tag="008">880701n||azznnbabn | ana |c</controlfield>
<datafield tag="024" ind1="7" ind2=" ">
<subfield code="a">http://d-nb.info/gnd/4043238-5</subfield>
<subfield code="2">uri</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="a">(DE-101)040432386</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="a">(DE-588)4043238-5</subfield>
</datafield>
<datafield tag="035" ind1=" " ind2=" ">
<subfield code="z">(DE-588c)4043238-5</subfield>
<subfield code="9">v:zg</subfield>
</datafield>
<datafield tag="040" ind1=" " ind2=" ">
<subfield code="a">DE-101</subfield>
<subfield code="9">r:DE-101</subfield>
<subfield code="b">ger</subfield>
<subfield code="d">9999</subfield>
</datafield>
<datafield tag="042" ind1=" " ind2=" ">
<subfield code="a">gnd1</subfield>
</datafield>
<datafield tag="065" ind1=" " ind2=" ">
<subfield code="a">13.3</subfield>
<subfield code="2">sswd</subfield>
</datafield>
<datafield tag="075" ind1=" " ind2=" ">
<subfield code="b">s</subfield>
<subfield code="2">gndgen</subfield>
</datafield>
<datafield tag="075" ind1=" " ind2=" ">
<subfield code="b">saz</subfield>
<subfield code="2">gndspec</subfield>
</datafield>
<datafield tag="079" ind1=" " ind2=" ">
<subfield code="a">g</subfield>
<subfield code="q">s</subfield>
<subfield code="u">w</subfield>
<subfield code="u">o</subfield>
<subfield code="u">z</subfield>
</datafield>
<datafield tag="083" ind1="0" ind2="4">
<subfield code="a">751.45</subfield>
<subfield code="9">d:3</subfield>
<subfield code="9">t:2007-01-01</subfield>
<subfield code="2">22/ger</subfield>
</datafield>
<datafield tag="150" ind1=" " ind2=" ">
<subfield code="a">Ölmalerei</subfield>
</datafield>
<datafield tag="450" ind1=" " ind2=" ">
<subfield code="a">Ölgemälde</subfield>
</datafield>
<datafield tag="550" ind1=" " ind2=" ">
<subfield code="0">(DE-101)040372200</subfield>
<subfield code="0">(DE-588)4037220-0</subfield>
<subfield code="0">http://d-nb.info/gnd/4037220-0</subfield>
<subfield code="a">Malerei</subfield>
<subfield code="4">obal</subfield>
<subfield code="4">http://d-nb.info/standards/elementset/gnd#broaderTermGeneral</subfield>
<subfield code="w">r</subfield>
<subfield code="i">Oberbegriff allgemein</subfield>
</datafield>
<datafield tag="670" ind1=" " ind2=" ">
<subfield code="a">M</subfield>
</datafield>
<datafield tag="677" ind1=" " ind2=" ">
<subfield code="a">Wird i.d.R. nur verwendet, wenn die Maltechnik behandelt ist.</subfield>
</datafield>
<datafield tag="750" ind1=" " ind2="7">
<subfield code="a">Peinture à l'huile</subfield>
<subfield code="0">(FrPBN)FRBNF119329441</subfield>
<subfield code="0">http://data.bnf.fr/11932944</subfield>
<subfield code="2">ram</subfield>
<subfield code="9">v:MACS-Mapping. Bitte keine Änderungen vornehmen.</subfield>
</datafield>
<datafield tag="913" ind1=" " ind2=" ">
<subfield code="S">swd</subfield>
<subfield code="i">s</subfield>
<subfield code="a">Ölmalerei</subfield>
<subfield code="0">(DE-588c)4043238-5</subfield>
</datafield>
</record>
</recordData>
<recordPosition>1</recordPosition>
</record>
</records>
<nextRecordPosition>2</nextRecordPosition>
<echoedSearchRetrieveRequest>
<version>1.1</version>
<query>WOE=4043238-5 and COD=s</query>
<xQuery xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true" />
<recordSchema>MARC21-xml</recordSchema>
</echoedSearchRetrieveRequest>
<extraResponseData>
<accountOf xmlns="">Staatsbibliothek zu Berlin - Preußischer Kulturbesitz, bpk-Bildagentur</accountOf>
</extraResponseData>
</searchRetrieveResponse>
当我 运行 下面的 php 代码时，我只得到一个空白页。哪个代码缺少访问例如 datafield 与 tag 150 和相应的 subfield？我错过了什么？
php代码：
header('Content-type: text/html; charset=utf-8');
error_reporting(E_ALL);
$id = $_POST["id"];
// URL to fetch
$url = "https://services.dnb.de/sru/authorities?version=1.1&operation=searchRetrieve&query=WOE%3D$id%20and%20COD%3Ds&recordSchema=MARC21-xml";
// Setting the HTTP Request Headers
$User_Agent = 'Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Firefox/60.0';
$request_headers = array('Contect-Type:text/xml', 'Accept:text/xml');
$ch = curl_init($url);
// Set the url
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt($ch, CURLOPT_USERAGENT, $User_Agent);
curl_setopt($ch, CURLOPT_HTTPHEADER, $request_headers);
curl_setopt($ch, CURLOPT_ENCODING, "");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Execute
$result = curl_exec($ch); // Performs the Request, with specified curl_setopt() options (if any).
// Closing
curl_close($ch);
$xml = SimpleXMLElement($result) or die("Error: Cannot create object");
echo($xml);
我环顾四周，发现它可能与将它传递给字符串有关，但后来我在屏幕上什么也看不到。甚至 SimpleXMLElement 对象。
感谢您的帮助
SimpleXMLElement 是一个 class 名称，不是函数。尝试用 new:
实例化它$xml = new SimpleXMLElement($result);
或使用 simplexml_load_string。
$xml = simplexml_load_string($result);
此外，您使用所有 curl 代码使事情过于复杂。这应该同样有效：
// ALWAYS sanitize user-submitted data
// in this example everything except numbers and hyphens are removed
$id = preg_replace("/[^0-9-]/", "", $_POST["id"]);
$url = "https://services.dnb.de/sru/authorities?version=1.1&operation=searchRetrieve&query=WOE%3D$id%20and%20COD%3Ds&recordSchema=MARC21-xml";
$xml = new SimpleXMLElement($url, 0, true);
评论和其他答案涵盖了您未获得任何输出的原因。这是因为缺少 new 关键字。这将向您展示如何获取结果对象并对其进行解析以获取所需的子字段。这只是转储子字段对象，但您可以从这里用它做任何您想做的事。
$xmlObj = new SimpleXMLElement($xml);
foreach($xmlObj->records->record->recordData->record->datafield as $dfield)
{
if((string)$dfield["tag"] == "150")
{
$subfield = $dfield->subfield;
var_dump($subfield);
}
}