How to get value from XML id - PHP - php

Question

I'd appreciate if someone could help me to solve this issue.
I'm getting this XML by reading a XML file through de code:
$x = simplexml_load_file($link);
$g = $x->attributeGroup;
foreach($g->xpath("//PARAMETER") as $attr){
var_dump((string)$attr->attributes()->ID);
var_dump((string)$attr->attributes()->VALUE);
var_dump((string)$attr); // for text value
}
I need to get the VALUE inside ID=sitPag, but I'm not able to.
Could anybody help me to do that?
<consulta>
<PARAMETER>
<PARAM ID="CodEmp" VALUE="1234"/>
<PARAM ID="Pedido" VALUE="00010714"/>
<PARAM ID="Valor" VALUE="351,20"/>
<PARAM ID="tipPag" VALUE="02"/>
<PARAM ID="sitPag" VALUE="00"/>
<PARAM ID="ValorPago" VALUE="000000351,20"/>
<PARAM ID="dtPag" VALUE="15012020"/>
<PARAM ID="codAut" VALUE=""/>
<PARAM ID="numId" VALUE=""/>
<PARAM ID="compVend" VALUE=""/>
<PARAM ID="tipCart" VALUE=""/>
</PARAMETER>
</consulta>
After calling simplexml_load_file(), I'm gettin it:
object(SimpleXMLElement)#3 (1) { ["PARAMETER"]=> object(SimpleXMLElement)#5 (1) { ["PARAM"]=> array(11) { [0]=> object(SimpleXMLElement)#6 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(6) "CodEmp" ["VALUE"]=> string(26) "1234" } } [1]=> object(SimpleXMLElement)#7 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(6) "Pedido" ["VALUE"]=> string(8) "00010714" } } [2]=> object(SimpleXMLElement)#8 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(5) "Valor" ["VALUE"]=> string(6) "351,20" } } [3]=> object(SimpleXMLElement)#9 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(6) "tipPag" ["VALUE"]=> string(2) "02" } } [4]=> object(SimpleXMLElement)#10 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(6) "sitPag" ["VALUE"]=> string(2) "00" } } [5]=> object(SimpleXMLElement)#11 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(9) "ValorPago" ["VALUE"]=> string(12) "000000351,20" } } [6]=> object(SimpleXMLElement)#12 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(5) "dtPag" ["VALUE"]=> string(8) "15012020" } } [7]=> object(SimpleXMLElement)#13 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(6) "codAut" ["VALUE"]=> string(0) "" } } [8]=> object(SimpleXMLElement)#14 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(5) "numId" ["VALUE"]=> string(0) "" } } [9]=> object(SimpleXMLElement)#15 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(8) "compVend" ["VALUE"]=> string(0) "" } } [10]=> object(SimpleXMLElement)#16 (1) { ["#attributes"]=> array(2) { ["ID"]=> string(7) "tipCart" ["VALUE"]=> string(0) "" } } } } }

Answer 1

It might not be the most efficient (you have to go through each PARAM element until the desired one is found, which could be many), but this will get the job done.
$x = simplexml_load_string($xmlString);
foreach($x->PARAMETER->PARAM as $param){
if((string)$param->attributes()->ID == "sitPag")
{
echo (string)$param->attributes()->VALUE;
break;
}
}
DEMO

Answer 2

Use Xpath expression to fetch the nodes or values. SimpleXMLElement::xpath() returns an array of SimpleXMLElement instances.
$consulta = new SimpleXMLElement($xml);
$params = $consulta->xpath('PARAMETER/PARAM[#ID="sitPag"]');
$sitPag = isset($params[0]) ? (string)$params[0]['VALUE'] : '';
var_dump($sitPag);
In DOM you can use DOMXpath::evaluate() to fetch the attribute value directly:
$document = new DOMDocument();
$document->loadXML($xml);
$xpath = new DOMXpath($document);
$sitPag = $xpath->evaluate('string(/consulta/PARAMETER/PARAM[#ID="sitPag"]/#VALUE)');
var_dump($sitPag);

Answer 3

In DOM you can use DOMXpath::evaluate() to fetch the attribute value directly:
$document = new DOMDocument();
$document->loadXML($xml);
$xpath = new DOMXpath($document);
$sitPag = $xpath->evaluate('string(/consulta/PARAMETER/PARAM[#ID="sitPag"]/#VALUE)');
var_dump($sitPag);
Or
$x = simplexml_load_string($xmlString);
foreach($x->PARAMETER->PARAM as $param){
if((string)$param->attributes()->ID == "sitPag")
{
echo (string)$param->attributes()->VALUE;
break;
}
}