0

我正在尝试流式解析大约 4GB 的 XML 文件并将其部分写入 PHP 中的新 XML 文件。

~4GB XML 文档的结构是这样的，我试图保留<doc>元素及其<title></title> <url></url>子元素<abstract></abstract>。

但是当我运行这个脚本时，我得到的只是一个<doc />每行一个文件。所以基本上它是复制<doc>元素并使它们自动关闭，而不是复制它的子元素。

<?php

    $interestingNodes = array('title','url','abstract');
    $xmlObject = new XMLReader();
    $xmlObject->open('file.xml');

    $xmlOutput = new XMLWriter();
    $xmlOutput->openURI('destfile.xml');
    $xmlOutput->setIndent(true);
    $xmlOutput->setIndentString("   ");
    $xmlOutput->startDocument('1.0', 'UTF-8');

    while($xmlObject->read()){
        if($xmlObject->name == 'doc'){
             $xmlOutput->startElement('doc');
             $xmlObject->readInnerXML();
             if(array_search($xmlObject->name, $interestingNodes)){
                 $xmlOutput->startElement($xmlObject->name);
                 $xmlOutput->text($xmlObject->value);
                 $xmlOutput->endElement(); //close the current node
             }
             $xmlOutput->endElement(); //close the doc node
        }
    }

    $xmlObject->close();
    $xmlOutput->endDocument();
    $xmlOutput->flush();

?>

这是 file.xml 的样子：

<feed>
    <doc>
        <title>Title of first doc is here</title>
        <url>URL is here</url>
        <abstract>Abstract is here...</abstract>
        <links>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
       </link>
    </doc>
    <doc>
        <title>Title of second doc is here</title>
        <url>URL is here</url>
        <abstract>Abstract is here...</abstract>
        <links>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
            <sublink>Link is here</sublink>
        </link>
    </doc>
 </feed>

这就是我希望 destfile.xml 的样子：

    <doc>
        <title>Title of first doc is here</title>
        <url>URL is here</url>
        <abstract>Abstract is here...</abstract>
    </doc>
    <doc>
        <title>Title of second doc is here</title>
        <url>URL is here</url>
        <abstract>Abstract is here...</abstract>
    </doc>

但是，当我在上面运行该脚本时，我得到的只是：

<doc />
<doc />
<doc />
<doc />
<doc />
<doc />
/* And many, many more <doc />s */
4

1 回答 1

0

我相信以下内容会做你想做的事情：

<?php

    $interestingNodes = array('title','url','abstract');
    $xmlObject = new XMLReader();
    $xmlObject->open('file.xml');

    $xmlOutput = new XMLWriter();
    $xmlOutput->openURI('destfile.xml');
    $xmlOutput->setIndent(true);
    $xmlOutput->setIndentString("   ");
    $xmlOutput->startDocument('1.0', 'UTF-8');

    while($xmlObject->read()){
        if($xmlObject->name == 'doc'){
            if($xmlObject->nodeType==XMLReader::END_ELEMENT) $xmlOutput->endElement();
            else $xmlOutput->startElement('doc');
        }
        if(in_array($xmlObject->name, $interestingNodes)){
            $xmlOutput->startElement($xmlObject->name);
            $xmlOutput->text($xmlObject->readString());
            $xmlOutput->endElement(); //close the current node
        }
    }

    $xmlObject->close();
    $xmlOutput->endDocument();
    $xmlOutput->flush();

?>
于 2013-09-16T08:29:10.007 回答