PHP

Question

PHP - 如果每个记录的元素具有相似的标签

，则获取正确的 XML 值

我正在获取以下 xml 文件：

XML 文件:

<?xml version='1.0' encoding='UTF-8'?>
<abc:ABCData xmlns:abc="http://www.abc-example.com" xmlns:xyz="http:/www.xyz-example.com">
<abc:ABCRecords>
 <abc:ABCRecord>
 <abc:ABC>5EXZX4LPK</abc:ABC>
  <abc:Entity>
    <abc:Name>I Bornheim</abc:Name>
    <abc:Periods>
      <abc:Period>
        <abc:Start>2017-01-01</abc:Start>
        <abc:End>2017-12-31</abc:End>
        <abc:Type>ACCOUNTING</abc:Type>
      </abc:Period>
      <abc:Period>
        <abc:Start>2007-09-01</abc:Start>
        <abc:Type>RELATIONSHIP</abc:Type>
      </abc:Period>
    </abc:Periods>      
  </abc:Entity>
</abc:ABCRecord>
<abc:ABCRecord>
  <abc:ABC>5967007LI</abc:ABC>
  <abc:Entity>
    <abc:Name>SUN BANK</abc:Name>
    <abc:Periods>
      <abc:Period>
        <abc:Start>2018-01-01</abc:Start>
        <abc:End>2018-12-31</abc:End>
        <abc:Type>BALANCED</abc:Type>
      </abc:Period>
      <abc:Period>
        <abc:Start>2008-09-01</abc:Start>
        <abc:Type>PARENT</abc:Type>
      </abc:Period>
    </abc:Periods>          
  </abc:Entity>
</abc:ABCRecord>
</abc:ABCRecords>
</abc:ABCData>

...使用此脚本，我将值输出为 csv:

PHP 文件:

<?php

$reader = new XMLReader();
$reader->open('php://stdin');

$output = fopen('php://stdout', 'w');
fputcsv($output, ['id', 'name']);

$xmlns = [
  'abc' => 'http://www.abc-example.com'
];

$dom   = new DOMDocument;
$xpath = new DOMXpath($dom);
foreach ($xmlns as $prefix => $namespaceURI) {
  $xpath->registerNamespace($prefix, $namespaceURI);
}

while (
  $reader->read() && 
  (
    $reader->localName !== 'ABCRecord' || 
    $reader->namespaceURI !== $xmlns['abc']
  )
) {
  continue;
}

while ($reader->localName === 'ABCRecord') {
  if ($reader->namespaceURI === 'http://www.abc-example.com') {
    $node = $reader->expand($dom);
    fputcsv(
      $output, 
      [
        $xpath->evaluate('string(abc:ABC)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Name)', $node)
      ]
    );
  }

  $reader->next('ABCRecord');
}

...像这样：

输出：

5EXZX4LPK,"I Bornheim"
5967007LI,"SUN BANK"

但是...如果每个期间记录都具有相同的标签定义，我如何获取正确的 'period' 值？

期望的输出：

5EXZX4LPK,"I Bornheim",2017-01-01,2017-12-31,"ACCOUNTING",2007-09-01,"RELATIONSHIP"
5967007LI,"SUN BANK",2018-01-01,2018-12-31,"BALANCED",2008-09-01,"PARENT"

Answer 1

您可以简单地使用XPath 的索引表示法；将 <abc:Period> 元素视为数组中的元素。请记住，XPath 索引是从一开始的，而不是从零开始的。

...
    fputcsv(
      $output, 
      [
        $xpath->evaluate('string(abc:ABC)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Name)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Periods/abc:Period[1]/abc:Start)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Periods/abc:Period[1]/abc:End)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Periods/abc:Period[1]/abc:Type)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Periods/abc:Period[2]/abc:Start)', $node),
        $xpath->evaluate('string(abc:Entity/abc:Periods/abc:Period[2]/abc:Type)', $node),
      ]
    );
...

输出：

id,name
5EXZX4LPK,"I Bornheim",2017-01-01,2017-12-31,ACCOUNTING,2007-09-01,RELATIONSHIP
5967007LI,"SUN BANK",2018-01-01,2018-12-31,BALANCED,2008-09-01,PARENT

Answer 2

您可以使用该类型对句点进行分组并获取第一个分组结果：

$xpath->evaluate(
    'string(
        abc:Entity/abc:Periods/abc:Period[
            abc:Type = "ACCOUNTING" or abc:Type="BALANCED"
        ][1]/abc:Type
    )', 
    $node
),

或者你检查这里是否有一个 abc:End 子元素：

$xpath->evaluate(
    'string(
        abc:Entity/abc:Periods/abc:Period[
            count(abc:End) = 0
        ][1]/abc:Type
    )', 
    $node
),

PHP - 如果每个记录的元素具有相似的标签，则获取正确的 XML 值

PHP - Fetch correct XML values if elements have similar tags per record

xml

xpath

xmlreader