array to xml

arrayToXML.php

<?php

$arr = [
  'Rooms' => [
        '1' => [
            'name' => 'xxx',
            'desc' => 'xxx'
        ],
        '2' => [
            'name' => 'yyy',
            'desc' => 'yyy'
        ],
        '3' => [
            'name' => 'zzz',
            'desc' => 'zzz'
        ]
    ]  
];

function arrayToXml($arr, $response = '')
{
    $x = "";
    foreach ($arr as $key => $value)
    {
        
        if (is_array($value))
        {
            if (is_numeric($key))
            {
                $x .= "<Child Index=\"$key\">";
                $x .= arrayToXml($value);
                $x .= "</Child>";
            }
            else
            {
                $x .= "<$key>";
                $x .= arrayToXml($value);
                $x .= "</$key>";
            }
        }
        else
        {
            $x .= "<$key>";
            $x .= "$value";
            $x .= "</$key>";
        }
    }
    
    return $x;
}

echo arrayToXml($arr);

/*
<Rooms>
    <Child Index="1">
        <name>xxx</name>
        <desc>xxx</desc>
    </Child>
    <Child Index="2">
        <name>yyy</name>
        <desc>yyy</desc>
    </Child>
    <Child Index="3">
        <name>zzz</name>
        <desc>zzz</desc>
    </Child>
</Rooms>
*/