<?xml version="1.0" encoding="UTF-8"?>
<root>
	<element>
		<username>A</username>
		<about>
			<description>random description</description>
			<from>A place on earth</from>
			<since>1999</since>
		</about>
		<person>
			<gender>female</gender>
			<age>29</age>
			<status>single</status>
		</person>
		<profileImage>url to jpg</profileImage>
	</element>
	<element>
		<username>B</username>
		<about>
			<description>random description</description>
			<from>A place on earth</from>
			<since>1999</since>
		</about>
		<person>
			<gender>female</gender>
			<age>35</age>
			<status>single</status>
		</person>
		<profileImage>url to jpg</profileImage>
	</element>
	<element>
		<username>C</username>
		<about>
			<description>random description</description>
			<from>A place on earth</from>
			<since>1999</since>
		</about>
		<person>
			<gender>female</gender>
			<age>18</age>
			<status>single</status>
		</person>
		<profileImage>url to jpg</profileImage>
	</element>
	<element>
		<username>D</username>
		<about>
			<description>random description</description>
			<from>A place on earth</from>
			<since>1999</since>
		</about>
		<person>
			<gender>female</gender>
			<age>22</age>
			<status>single</status>
		</person>
		<profileImage>url to jpg</profileImage>
	</element>
	<element>
		<username>E</username>
		<about>
			<description>random description</description>
			<from>A place on earth</from>
			<since>1999</since>
		</about>
		<person>
			<gender>female</gender>
			<age>31</age>
			<status>single</status>
		</person>
		<profileImage>url to jpg</profileImage>
	</element>
</root>

<?php


/////////////////////////////sort xml////////////////////////////////////////////////////

$url = 'test.xml';
$xml = simplexml_load_file($url);

$items = array();
foreach($xml->element as $item) {
    $items[] = $item;
};
// Custom sort on the names of the items:
usort ($items, function($a, $b ) {
    return strcmp($a->person->age[0] , $b->person->age[0]);
});

foreach ($items as $item) {
    echo $item->username . "<br/>" . $item->person->age . "<br/><br/>";
}

?>