Accessing attribute from xml string in php

I have a php application and I am trying to echo a atrribute from the xml.

Here is the xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <header 
xmlns="xxx:xxx:xxxx:xxx:respUploadFisier:v1" dateResponse="202202" 
ExecutionStatus="0" index="206"/>

This is what I have tried till now:

xml = simplexml_load_string($result2);
foreach($xml->header[3]->attributes() as $a => $b) {
echo $a,'="',$b,""n";
}

But it gives me this errors:

Warning: simplexml_load_string(): Entity: line 1: parser error : Start tag expected, 
 '<' not found in C:xampphtdocsefacturaverificastarea.php on line 80

Warning: simplexml_load_string(): &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF- 
8&quot; standalone=&quot;yes in C:xampphtdocsefacturaverificastarea.php on line 80

Warning: simplexml_load_string(): ^ in C:xampphtdocsefacturaverificastarea.php on 
line 80

Notice: Trying to get property 'header' of non-object in 
C:xampphtdocsfactverificastarea.php on line 81

Notice: Trying to access array offset on value of type null in 
C:xampphtdocsfactverificastarea.php on line 81

Fatal error: Uncaught Error: Call to a member function attributes() on null in 
C:xampphtdocsfactverificastarea.php:81 Stack trace: #0 {main} thrown in 
C:xampphtdocsfactverificastarea.php on line 81

Can someone give me an example to extract from the xml from the beginning of the post the index ? Thanks in advance. I am a newbie in php

Answer

To get a specific attribute you can try like this :

$xml=simplexml_load_string($myXMLData) or die("Error: Cannot create object");

function xml_attribute($object, $attribute)
{
    if(isset($object[$attribute]))
        return (string) $object[$attribute];
}

print_r(xml_attribute($xml,'dateResponse'));