PHP多维数组生成XML

$arr = [
    'count' => 2,
    'baseInfo' => [
        'resourceId' => 10001,
        'sights' => [
            'sight' => [
                'sightName' => '平遥古城',
                'sightAddress' => '山西平遥',
                'city' => '平遥',
                'sightlon' => '',
                'sightlat' => '',
            ],
            'productName' => ''
        ],
    ],
];

function createXml($arr) {
    $xml = '';
    
    foreach ($arr as $k => $v) {
        $xml .= '<'.$k.'>';
        if (!is_array($v)) {
            $xml .= $v.'</'.$k.'>';
        }else{
            $xml .= createXml($v);
            $xml .= '</'.$k.'>';
        }
    }
    return $xml;
}

echo createXml($arr);

以下是结果

<count>2</count>
<baseInfo>
    <resourceId>10001</resourceId>
    <sights>
        <sight>
            <sightName>平遥古城</sightName>
            <sightAddress>山西平遥</sightAddress>
            <city>平遥</city>
            <sightlon></sightlon>
            <sightlat></sightlat>
        </sight>
        <productName></productName>
    </sights>
</baseInfo>