xPath SimpleXMLElement中的XML子节点

时间:2015-03-02 10:37:00

标签: php xml xpath

来自这个答案XML data extraction using PHP simpleXML

在使用xpath时,我仍然无法获取子节点。以前在某些上下文中我使用->children();确实帮助了我,但在xpath上我无法使用children();我也尝试使用//来查看是否可以获取所有子节点内容,但仍然没有运气。

我的PHP代码是

$xml = simplexml_load_string(file_get_contents($fileloc));
$json = json_encode($xml);
$array = json_decode($json,TRUE);
$node = $xml->xpath('//Note[@id="f2"]/P');
$array = json_decode(json_encode($node), true);
print_r($array);

另外,如何打印输出?我尝试使用echo的每个循环,但它没有用。

当我使用print_r时,它显示为Array ( [0] => Array ( [Pubref] => [] ) )

我的XML结构就像

<Notes>
    <Note id="f1" type="foot" display="1">
        <P>The second respondent by virtue of the extended definition of “foreign state” in s 3(3) of the Act.</P>
    </Note>
    <Note id="f2" type="foot" display="2">
        <P>
            <Pubref>[<Year>1965</Year>] <Series>VR</Series><Pages>204</Pages></Pubref>.</P>
    </Note>
    <Note id="f3" type="foot" display="3">
        <P>Ibid, 206.</P>
    </Note>
    <Note id="f4" type="foot" display="4">
        <P>
            <Emph type="i">Foreign State Immunity</Emph>, ALRC 24, (1984).</P>
    </Note>
    <Note id="f5" type="foot" display="5">
        <P>Ibid, 55, [93].</P>
    </Note>
    <Note id="f6" type="foot" display="6">
        <P>Macquarie Dictionary (5th ed, 2009), 1475.</P>
    </Note>
    <Note id="f7" type="foot" display="7">
        <P>Ibid, 727.</P>
    </Note>
    <Note id="f8" type="foot" display="8">
        <P>
            <Emph type="i">Foreign State Immunity</Emph>, ALRC 24, 1984, p xviii, [17] and p 51, [90].</P>
    </Note>
    <Note id="f9" type="foot" display="9">
        <P>
            <Pubref>(<Year>2011</Year>) <Vol>192</Vol><Series>FCR</Series><Pages>393</Pages></Pubref>.</P>
    </Note>
    <Note id="f10" type="foot" display="10">
        <P>Ibid, 437.</P>
    </Note>
    <Note id="f11" type="foot" display="11">
        <P>
            <Pubref>(<Year>2004</Year>) <Vol>185</Vol><Series>FLR</Series><Pages>48</Pages></Pubref>.</P>
    </Note>
    <Note id="f12" type="foot" display="12">
        <P>Ibid, [108].</P>
    </Note>
    <Note id="f13" type="foot" display="13">
        <P>(2005) 12 VR 340, 346.</P>
    </Note>
    <Note id="f14" type="foot" display="14">
        <P>
            <Pubref>[<Year>1987</Year>] <Vol>1</Vol><Series>Qd R</Series><Pages>221</Pages></Pubref>.</P>
    </Note>
    <Note id="f15" type="foot" display="15">
        <P>
            <MNCit>[2008] QCA 328</MNCit>.</P>
    </Note>
    <Note id="f16" type="foot" display="16">
        <P>
            <Pubref>[<Year>2013</Year>] <Vol>1</Vol><Series>Qd R</Series><Pages>204</Pages></Pubref>.</P>
    </Note>
    <Note id="f17" type="foot" display="17">
        <P>[1955] AC 72.</P>
    </Note>
    <Note id="f18" type="foot" display="18">
        <P>
            <Pubref>(<Year>1988</Year>) <Vol>17</Vol><Series>NSWLR</Series><Pages>623</Pages></Pubref>.</P>
    </Note>
    <Note id="f19" type="foot" display="19">
        <P>
            <Pubref>(<Year>2010</Year>) <Vol>79</Vol><Series>NSWLR</Series><Pages>513</Pages></Pubref>.</P>
    </Note>
    <Note id="f20" type="foot" display="20">
        <P>[1955] AC 72, 87.</P>
    </Note>
    <Note id="f21" type="foot" display="21">
        <P>Ibid, 89–90.</P>
    </Note>
    <Note id="f22" type="foot" display="22">
        <P>
            <Pubref>(<Year>1988</Year>) <Vol>17</Vol><Series>NSWLR</Series><Pages>623</Pages></Pubref>, 630.</P>
    </Note>
    <Note id="f23" type="foot" display="23">
        <P>
            <Pubref>(<Year>2010</Year>) <Vol>79</Vol><Series>NSWLR</Series><Pages>513</Pages></Pubref>.</P>
    </Note>
    <Note id="f24" type="foot" display="24">
        <P>
            <Pubref>(<Year>1988</Year>) <Vol>17</Vol><Series>NSWLR</Series><Pages>623</Pages></Pubref>, 633 per Cole J cited in <Xref ref="cr11" role="cr"><Name><Emph type="i">Zhang v Zemin</Emph></Name><Pubref>(<Year>2010</Year>) <Vol>79</Vol><Series>NSWLR</Series><Pages>513</Pages></Pubref>, 524</Xref>.</P>
    </Note>
    <Note id="f25" type="foot" display="25">
        <P>
            <Pubref>[<Year>1983</Year>] <Vol>1</Vol><Series>AC</Series><Pages>244</Pages></Pubref>.</P>
    </Note>
    <Note id="f26" type="foot" display="26">
        <P>
            <Pubref>(<Year>2012</Year>) <Vol>247</Vol><Series>CLR</Series><Pages>240</Pages></Pubref>.</P>
    </Note>
    <Note id="f27" type="foot" display="27">
        <P>
            <Pubref>[<Year>1983</Year>] <Vol>1</Vol><Series>AC</Series><Pages>244</Pages></Pubref>, 262.</P>
    </Note>
    <Note id="f28" type="foot" display="28">
        <P>At [23].</P>
    </Note>
</Notes>

2 个答案:

答案 0 :(得分:1)

只需剥开围绕<year>孩子的方括号,它对我有用:

$xml = new SimpleXMLElement(
'<Notes>
    <Note id="f1" type="foot" display="1">
        <P>The second respondent by virtue of the extended definition of [...] in s 3(3) of the Act.</P>
    </Note>
    <Note id="f2" type="foot" display="2">
        <P>
            <Pubref><Year>1965</Year> <Series>VR</Series><Pages>204</Pages></Pubref>.</P>
    </Note>
    [....]
</Notes>');

$array = $xml->xpath("/Notes/Note[@id=\"f2\"]/P");
var_dump($array[0]->children());

打印

object(SimpleXMLElement)#3 (1) {
  ["Pubref"]=>
  object(SimpleXMLElement)#5 (3) {
    ["Year"]=>
    string(4) "1965"
    ["Series"]=>
    string(2) "VR"
    ["Pages"]=>
    string(3) "204"
  }
}

要显示结果,只需执行另一个->children()即可获得您需要的结果并使用foreach:

$array = $xml->xpath("/Notes/Note[@id=\"f2\"]/P");
$children = $array[0]->children()->children();

foreach($children as $k => $v)
    echo "[$k] => $v";

编辑: 正如@ n​​l-x所建议的那样,为了保留括号,您只需以这种方式更新xpath:"/Notes/Note[@id=\"f2\"]/P/*"。然后在->children()中,您将拥有所需的所有节点

答案 1 :(得分:1)

您不能只在xmlelement列表中使用json_encode来获取xpath。 xmlelement列表是xmlelements的数组。并且json_encode强制xml元素执行->__toString(),只返回元素内部的文本。 (而不是儿童元素。)

因此在您的示例中,代码将返回带有一些空格的.,因为您的xpath返回仅包含1个元素的xmlelement列表(<p>),并且该列表仅包含子元素和一些文本(空格和.

要获取元素的内部xml,您应该使用->asXML()

$xml = simplexml_load_string($xmlstring);
$elements = $xml->xpath('//Note[@id="f2"]/P');
foreach ($elements as $element) {
    echo $element->asXML();
}

打印:

<P><Pubref>[<Year>1965</Year>] <Series>VR</Series> <Pages>204</Pages></Pubref>.</P>