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通过PHP检索XML页面的元素

xml php

stormdrain · 技术社区 · 16 年前

我试着用PHP和XML来概括我的想法。

我想做点什么:

我正在通过cURL检索一个XML文档(还尝试了各种PHP XML库参数,例如 XMLReader::open($url)

问题是解析检索到的页面上的XML。

http://z3950.loc.gov:7090/voyager?version=1.1&operation=searchRetrieve&query=9780471615156&maximumRecords=1&recordPacking=xml&recordSchema=marcxml

我需要从那一页得到的是电话号码;

<datafield tag="060" ind1=" " ind2=" ">
  <subfield code="a">WM 173.6 R823m</subfield>
</datafield>

作者;

<datafield tag="100" ind1="1" ind2=" ">
  <subfield code="a">Ross, Colin A.</subfield>
</datafield>

和标题信息;

<datafield tag="245" ind1="1" ind2="0">
  <subfield code="a">Multiple personality disorder :</subfield>
  <subfield code="b">diagnosis, clinical features, and treatment /</subfield>
  <subfield code="c">Colin A. Ross.</subfield>
</datafield>

看起来很简单。然而,就我的一生而言,似乎无法让任何用于处理XML的内置PHP函数正常工作(因为我做得不对)。

//xml file retrieved via curl and saved to folder
$file="9780471615156.xml";

$xml = simplexml_load_file($file);

echo $xml->getName();//returns searchRetrieveResponse

foreach($xml->searchRetrieveResponse[0]->attributes() as $a => $b){
  echo $a,'="',$b,"\"</br>";//nothing
 }

foreach ($xml->searchRetrieveResponse[0]->children() as $child){
  echo "Child node: " . $child . "<br />";//nothing
}

它返回第一个节点的名称,但我无法让它更深入。

3 回复 | 直到 9 年前

dwich 16 年前

// load XML into string here
// $string = ????;
$xml_parser = xml_parser_create();
xml_parse_into_struct($xml_parser, $string, $object, $index);

echo '<pre>';
print_r($object);
// print_r($index);
echo '</pre>';

anarchivist 14 年前

考虑到您似乎希望解析MARCXML,我建议使用 File_MARC PEAR package

<?php

require_once('File/MARCXML.php');
$file="9780471615156.xml";
$record = new File_MARCXML($file);
echo "  call number: \n";
echo "   " . $record->getField('060')['a'];
echo "  author: \n";
echo "   " . $record->getField('100')['a'];
echo "  title: \n";
echo "   " . $record->getField('245')->formatField();

VolkerK 16 年前

xml_parse_into_struct()可能没有什么问题。但既然有人说这不能用SimpleXML实现:

<?php 
$file="http://z3950.loc.gov:7090/voyager?version=1.1&operation=searchRetrieve&query=9780471615156&maximumRecords=1&recordPacking=xml&recordSchema=marcxml";
$xml = simplexml_load_file($file);
$xml->registerXPathNamespace('foo', 'http://www.loc.gov/MARC21/slim');

foreach( $xml->xpath('//foo:record') as $record ) {
  echo "record: \n";
  $record->registerXPathNamespace('foo', 'http://www.loc.gov/MARC21/slim');
  foreach( $record->xpath('foo:datafield[@tag="060" or @tag="100" or @tag="245"]') as $datafield ) {
    switch($datafield['tag']) {
      case '060':
        echo "  call number: \n";
        break;
      case '100':
        echo "author: \n";
        break;
      case '245':
        echo "title : \n";
        break;
    }
    $datafield->registerXPathNamespace('foo', 'http://www.loc.gov/MARC21/slim');
    foreach( $datafield->xpath('foo:subfield') as $sf ) {
      echo '   ', $sf['code'] . ': ' . $sf . "\n";
    }    
  }
}

record: 
  call number: 
   a: WM 173.6 R823m
author: 
   a: Ross, Colin A.
title : 
   a: Multiple personality disorder :
   b: diagnosis, clinical features, and treatment /
   c: Colin A. Ross.

另请参见: http://docs.php.net/simplexmlelement.registerXPathNamespace 和 http://www.w3.org/TR/xpath/