Flatten and Inflate n-dimensional arrays in php

flatten

private function flatten($array, $base = "", $div_char = "/") 
{
    $ret = array();
    if(is_array($array)) 
    {
        foreach($array as $k => $v) 
        {
            if(is_array($v)) 
            {
                $tmp_array = flatten($v, $base.$k.$div_char, $div_char);
                $ret = array_merge($ret, $tmp_array);
            } 
            else
                $ret[$base.$k] = $v;
        }
    }
    return $ret;
}

inflate

private function inflate($array, $divider_char = "/") 
{
    if( !is_array($arr) )
        return false;

    $split = '/' . preg_quote($divider_char, '/') . '/';

    $ret = array();
    foreach ($array as $key => $val) 
    {
        $parts = preg_split($split, $key, -1, PREG_SPLIT_NO_EMPTY);
        $leafpart = array_pop($parts);
        $parent = &$ret;
        foreach ($parts as $part) 
        {
            if (!isset($parent[$part]))
                $parent[$part] = array();
            else if (!is_array($parent[$part]))
                $parent[$part] = array();

            $parent = &$parent[$part];
        }

        if (empty($parent[$leafpart]))
            $parent[$leafpart] = $val;
    }
    return $ret;
}