Xml.php

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<?php
namespace Magento\Framework\Convert;

class Xml
{
    public function xmlToAssoc(\SimpleXMLElement $xml)
    {
        $array = [];
        foreach ($xml as $key => $value) {
            if (isset($value->{$key})) {
                $i = 0;
                foreach ($value->{$key} as $v) {
                    $array[$key][$i++] = (string)$v;
                }
            } else {
                // try to transform it into string value, trimming spaces between elements
                $array[$key] = trim((string)$value);
                if (empty($array[$key]) && !empty($value)) {
                    $array[$key] = $this->xmlToAssoc($value);
                } else {
                    // untrim strings values
                    $array[$key] = (string)$value;
                }
            }
        }
        return $array;
    }
}