问题描述
我不得不重写部分程序以使用 XMLReader 选择 XML 文件的部分进行处理.
I had to rewrite part of a programme to use XMLReader to select parts of an XML file for processing.
以这个简化的 XML 为例:
Take this simplified XML as an example:
<odds>
<sport>
<region>
<group>
<event name="English Championship 2014-15" eventid="781016.1">
<bet name="Kazanan" betid="12377108.1">
<selection selectionid="52411062.1"/>
</selection>
</bet>
</event>
</group>
</region>
</sport>
</odds>
对 xpath() 的调用:
$bets = $xml->xpath(
"//odds/sport/region/group/event/bet/selection[contains(@selectionid,'".$selectionToFind."')]/.."
);
将选择整个 <bet> 节点及其子节点(<selection> 节点).
would select the whole <bet> node and its children (<selection> nodes).
然而，我的代码只会选择一个具有给定 selectionid 的
My code, however, would select only one <selection> node with a given selectionid:
$reader = new XMLReader;
$reader->open('file.xml');
while($reader->read()) {
$event = $reader->getAttribute($value);
if ($event == 781016.1 ) {
$node = new SimpleXMLElement($reader->readOuterXML());
var_dump($node);
break;
}
}
如何使用 XMLReader 复制 xpath() 的行为，以便我选择 <bet> 节点及其子节点，而不是只有一个 <selection> 孩子?
How can replicate the behaviour of xpath() with XMLReader so that I select the <bet> node and its children and not only one <selection> child?
我想问题归结为:我可以通过一个孩子的属性值来选择整个父节点<bet>，例如
I guess the question boils down to: Can I select the whole parent node <bet> by the attribute value of a child, e.g. <selection selectionid="[some_value]">?
推荐答案
[忽略SimpleXML方案，低头看XMLReader一个]
[Ignore the SimpleXML solution and look down at the XMLReader one]
我建议使用 SimpleXMLElement::xpath 方法.
I would suggest using the SimpleXMLElement::xpath method.
http://php.net/manual/en/simplexmlelement.xpath.php
$xml = new SimpleXMLElement($xml_string);
/* Search for <a><b><c> */
$result = $xml->xpath("/odds/sport/region/group/event/bet");
$result 将包含 'bet' 注释的所有子级.
$result will contain all children of 'bet' note.
//XMLReader 解决方案 ************************
// XMLReader solution **********************
$reader = new XMLReader;
$reader->open('file.xml');
$parent_element = null;
while($reader->read()) {
$selectionid = $reader->getAttribute('selectionid');
if ($selectionid == '52411062.1' ) {
// use the parent of the node with attribute 'selectionid' = '52411062.1'
$node = $parent_element;
var_dump($node);
break;
}
elseif ($reader->name === 'bet') { )
{
// store parent element
$parent_element = new SimpleXMLElement($reader->readOuterXML());
}
}
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