array to xml

index.php

<?php

function isAssoc(array $arr)
{
    if (array() === $arr) return false;
    return array_keys($arr) !== range(0, count($arr) - 1);
}

function toXml($name, $a) {
    $sReturn = "<$name>";
    foreach($a as $key => $val) {
        if (is_array($val)) {
            if (isAssoc($val)) {
                $sReturn .= toXml($key, $val);
            } else {
                foreach($val as $sub) {
                    $sReturn .= "<$key>$sub</$key>";
                }
            }
            
        } else {
            $sReturn .= "<$key>$val</$key>";
        }
    }
    $sReturn .= "</$name>";
    return $sReturn;
}

echo toXml("root", [
    "me" => 1,
    "items" => [1,2,3,4,5,6]
]);

/*
<root>
	<me>1</me>
	<items>1</items>
	<items>2</items>
	<items>3</items>
	<items>4</items>
	<items>5</items>
	<items>6</items>
</root>
*/