PHP: convert XML to XPath

convert-xml-to-xpath.php

<?php

// this function will show the full xpath of an XML file

// your code
$xml = new \SimpleXMLIterator('<root><node><foo bar="12">fooBar</foo><foo>bar</foo></node></root>');
$xpath = xmlToXPath($xml);

// the magic function
// from http://php.net/manual/fr/class.simplexmliterator.php#111916
function xmlToXPath($xml, $key = null, &$tmp = null)
{
    $keys_arr = array();

    // Get the keys count array
    for ($xml->rewind(); $xml->valid(); $xml->next()) {
        $sk = $xml->key();
        if (array_key_exists($sk, $keys_arr)) {
            $keys_arr[$sk]+=1;
            $keys_arr[$sk] = $keys_arr[$sk];
        }
        else {
            $keys_arr[$sk] = 1;
        }
    }

    // Create the xpath
    for ($xml->rewind(); $xml->valid(); $xml->next()) {
        $sk = $xml->key();
        if (!isset($$sk)) {
            $$sk = 1;
        }

        if ($keys_arr[$sk] >= 1) {
            $spk = $sk . '[' . $$sk . ']';
            $keys_arr[$sk] = $keys_arr[$sk] - 1;
            $$sk++;
        }
        else {
            $spk = $sk;
        }

        $kp = $key ? $key . '/' . $spk : '/' . $xml->getName() . '/' . $spk;
        if ($xml->hasChildren()) {
            xmlToXPath($xml->getChildren(), $kp, $tmp);
        }
        else {
            $tmp[$kp] = strval($xml->current());
        }

        $at = $xml->current()->attributes();
        if ($at) {
            $tmp_kp = $kp;
            foreach ($at as $k => $v) {
                $kp .= '/@' . $k;
                $tmp[$kp] = $v;
                $kp = $tmp_kp;
            }
        }
    }

    return $tmp;
}