How to echo information from xml in PHP - php

Question

I have some problems with echo line from xml file.
How i can do it fine?
I try to
$test = file_get_contents('');
$test = iconv('WINDOWS-1251', 'UTF-8', $test);
$test = "<xmp>".$test."</xmp>";
And try to find with preg_match_all, but it isn't work.
preg_match_all('/<ya:created dc:date="\d+\-\d+\-\d+\T\d+\:\d+\:\d+/', $test, $output_array);
It's work on https://www.phpliveregex.com/ but isn't work on my site.
https://www.phpliveregex.com/p/qCH
My XML:
<?xml version="1.0" encoding="WINDOWS-1251"?>
<rdf:RDF
xml:lang="ru"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:foaf="http://xmlns.com/foaf/0.1/"
xmlns:ya="http://blogs.yandex.ru/schema/foaf/"
xmlns:img="http://blogs.yandex.ru/schema/foaf/"
xmlns:dc="http://purl.org/dc/elements/1.1/">
<foaf:Person>
<ya:publicAccess>allowed</ya:publicAccess>
<foaf:gender>male</foaf:gender>
<ya:created dc:date="2011-01-30T16:43:45+03:00"/>
<ya:lastLoggedIn dc:date="2019-01-16T18:54:55+03:00"/>
<ya:modified dc:date="2019-01-13T21:15:43+03:00"/>
</foaf:Person>
</rdf:RDF>

Answer 1

You would be better accessing it using something like SimpleXML and XPath. There are at least two ways of doing it, both here rely on using XPath but you have to use the namespaces (the ya: bit) to ensure you get the right element. As XPath returns a list of matches, I just use [0] to get the first one, if there are multiple ones you can use a loop...
$test = file_get_contents("data.xml");
$xml = simplexml_load_string($test);
// Version 1
// Fetch the ya:created element
$created = $xml->xpath("//ya:created")[0];
// Extract the attributes and print the date
echo $created[0]->attributes("http://purl.org/dc/elements/1.1/")->date;
// Version 2
// Extract the dd:date attribute (using the #)
$createdDate = $xml->xpath("//ya:created/#dc:date")[0];
echo $createdDate;
Forgot to say - if you want to use these fields for a database etc. you may need to cast them to a string to make sure they are converted...
$date = (string)$createdDate;