Php loop throught Xml nodes - php

Question

I have Xml file like
<response>
<tag1>
<item>
<id>106</id>
<title>DG</title>
</item>
<item>
<id>105</id>
<title>AC</title>
</item>
</tag1>
<tag2>
<item>
<id>1</id>
<title>DjG</title>
</item>
<item>
<id>15</id>
<title>AoC</title>
</item>
</tag2>
</response>
I trying this code to extract ID and Title
$dom = new DomDocument();
$dom->load('xml.xml');
$xpath = new DOMXPath($dom);
foreach($xpath->evaluate('//response/*') as $node){
$params =$xpath->evaluate('//response/' .$node->nodeName . '/item/*');
foreach($params as $child) {
echo $node->nodeName ." = " .$child->nodeName ." = " .$child->nodeValue ."\n<br>";
}
}
But I get result such
<br>tag1 = id = 106
<br>tag1 = title = DG
<br>tag1 = id = 105
<br>tag1 = title = AC
<br>tag2 = id = 1
<br>tag2 = title = DjG
<br>tag2 = id = 15
<br>tag2 = title = AoC
But i need to get like this
tag1 = 106 = DG
tag1 = 105 = AC
tag2 = 1 = DjG
tag2 = 15 = AoC

Answer 1

On the second foreach, just target that $node->nodeName, then on the inner foreach target each id an title.
foreach($xpath->evaluate('//response/*') as $node) {
$tag = $node->nodeName;
$params = $xpath->evaluate("//$tag/*");
foreach($params as $child) {
$id = $xpath->evaluate('string(./id)', $child);
$title = $xpath->evaluate('string(./title)', $child);
echo $tag ." = " .$id ." = " .$title ."\n<br>";
}
}
Sample Output
Or the SimpleXML version:
$xml = simplexml_load_file('xml.xml');
foreach($xml as $tag =>$node) {
foreach($node as $item => $child) {
echo $tag ." = " .$child->id ." = " .$child->title ."\n<br>";
}
}
Sample Output

Answer 2

Use this code:
$dom = new DomDocument();
$dom->load('xml.xml');
$xpath = new DOMXPath($dom);
foreach($xpath->evaluate('//response/*') as $node){
$params =$xpath->evaluate('//response/' .$node->nodeName . '/*');
foreach($params as $child)
{
echo $node->nodeName ." = " .$child->getElementsByTagName('id')->item(0)->textContent ." = " .$child->getElementsByTagName('title')->item(0)->textContent ."\n<br>";
}
}

Answer 3

The second argument of DOMXpath::evaluate() is the context node. If you do not start the XPath expression with a slash, it will be relative to it. So inside a loop, you usually want to use the current node as the context for your expressions.
foreach ($xpath->evaluate('/absolute-expression') as $node) {
var_dump(
$xpath->evaluate('relative-expression', $node)
);
}
XPath (unlike CSS selectors) can fetch properties of the elements along different axes. You can get the local name (without namespace prefix) of a parent node with:
local-name(parent::*)
Using this, you can solve the problem with a single loop iterating the item elements.
Example:
$dom = new DomDocument();
$dom->loadXml($xml);
$xpath = new DOMXPath($dom);
foreach ($xpath->evaluate('//response/*/item') as $node) {
echo
$xpath->evaluate('local-name(parent::*)', $node), ' = ',
$xpath->evaluate('string(id)', $node), ' = ',
$xpath->evaluate('string(title)', $node), "\n";
}
Output:
tag1 = 106 = DG
tag1 = 105 = AC
tag2 = 1 = DjG
tag2 = 15 = AoC
Only, If you need to call source for each first level node (tag1, tag2). You will need two loops. Like output the items grouped by the tag* element node.
$dom = new DomDocument();
$dom->loadXml($xml);
$xpath = new DOMXPath($dom);
foreach ($xpath->evaluate('//response/*') as $node) {
echo
$xpath->evaluate('local-name()', $node),
"\n--------\n";
foreach ($xpath->evaluate('item', $node) as $item) {
echo
$xpath->evaluate('string(id)', $item), ' = ',
$xpath->evaluate('string(title)', $item), "\n";
}
echo "\n";
}
Output:
tag1
--------
106 = DG
105 = AC
tag2
--------
1 = DjG
15 = AoC