如何在php中获得xpath查询的结果?
我对如何从xpath查询中提取数据感到困惑。我使用的是PHP5.5.6,得到的结果是:如何在php中获得xpath查询的结果?,php,xml,domxpath,Php,Xml,Domxpath,我对如何从xpath查询中提取数据感到困惑。我使用的是PHP5.5.6,得到的结果是: I'm all the countries: DOMNodeList Object ( [length] => 0 ) 1 I'm all the countries: DOMNodeList Object ( [length] => 0 ) 1 I'm all the countries: DOMNodeList Object ( [length] => 0 ) 1
I'm all the countries:
DOMNodeList Object
(
[length] => 0
)
1
I'm all the countries:
DOMNodeList Object
(
[length] => 0
)
1
I'm all the countries:
DOMNodeList Object
(
[length] => 0
)
1
I'm all the countries:
DOMNodeList Object
(
[length] => 0
)
1
我的XML文件被截断(仅显示第一部分,我正在试验大型XML文件):
菲律宾
苏比克湾气象站
菲律宾
拉奥格
菲律宾
尼诺阿基诺国际机场
菲律宾
达沃机场
菲律宾
克拉克Ab
菲律宾
莱加斯皮
菲律宾
龙勃龙
我试图做的是通过xpath查询显示Country标记中的内容。我的代码是:
<?php
$reader = new XMLReader();
$reader->open("countries.xml", "UTF-8");
while($reader->read()){
//echo var_dump($reader->nodeType), "<br/>";
if($reader->nodeType == XMLReader::ELEMENT && $reader->localName == "Table"){
$node = $reader->expand();
$dom = new DOMDocument;
$xp = new DomXPath($dom);
$xp1 = $xp->query("//Country");
echo "I'm all the countries: <pre>",print_r($xp1),"</pre>";
}
}
$reader->close();
?>
您的DOM是空的,您永远不会向其添加$node
。尝试:
$reader=newXMLReader();
$reader->open(“countries.xml”、“UTF-8”);
而($reader->read()){
如果($reader->nodeType==XMLReader::ELEMENT&&$reader->localName==“表”){
$node=$reader->expand();
$dom=新的DOMDocument;
$n=$dom->importNode($node,true);
$dom->appendChild($n);
$xp=新的DomXPath($dom);
$xp1=$xp->query(“//国家”);
echo“我是所有国家:{$xp1->item(0)->nodeValue}”;
$reader = new XMLReader();
$reader->open("countries.xml", "UTF-8");
while($reader->read()){
if($reader->nodeType == XMLReader::ELEMENT && $reader->localName == "Table"){
$node = $reader->expand();
$dom = new DOMDocument;
$n = $dom->importNode($node, true);
$dom->appendChild($n);
$xp = new DomXPath($dom);
$xp1 = $xp->query("//Country");
echo "I'm all the countries: <pre>{$xp1->item(0)->nodeValue}</pre>";
}
}
$reader->close();
}
}
$reader->close();
它可以工作!这是有道理的。我对必须使用appendChild()感到困惑,因为我认为可能要修改原始XML文件,但现在我明白了,我这样做只是为了填充DOM,以便使用xpath。谢谢
$reader = new XMLReader();
$reader->open("countries.xml", "UTF-8");
while($reader->read()){
if($reader->nodeType == XMLReader::ELEMENT && $reader->localName == "Table"){
$node = $reader->expand();
$dom = new DOMDocument;
$n = $dom->importNode($node, true);
$dom->appendChild($n);
$xp = new DomXPath($dom);
$xp1 = $xp->query("//Country");
echo "I'm all the countries: <pre>{$xp1->item(0)->nodeValue}</pre>";
}
}
$reader->close();