Version of PHPs parse_str and http_build_query that handles query strings with more than one parameter with the same identifier in the same way as .NET

HTTP.php

<?php

namespace christianjul\util;

/** HTTP related utilities */
class HTTP {

    /**
     * PHP's built-in parse_str cannot properly handle querystrings that have parameters with the same identifier.
     *
     * This function returns these entries as an array.
     *
     * @see http://php.net/manual/en/function.parse-str.php#76792
     *
     * @param $str
     *
     * @return array
     */
    public static function parse_str($str) {
        # result array
        $arr = array();

        # split on outer delimiter
        $pairs = explode('&', $str);

        # loop through each pair
        foreach ($pairs as $i) {
            # split into name and value
            list($name,$value) = explode('=', $i, 2);

            $value = rawurldecode($value);

            # if name already exists
            if( isset($arr[$name]) ) {
                # stick multiple values into an array
                if( is_array($arr[$name]) ) {
                    $arr[$name][] = $value;
                }
                else {
                    $arr[$name] = array($arr[$name], $value);
                }
            }
            # otherwise, simply stick it in a scalar
            else {
                $arr[$name] = $value;
            }
        }

        # return result array
        return $arr;
    }

    /**
     * A version of http_build_query that reverses parse_str above
     *
     * Differences to PHP standard version is that parameter identifiers will be repeated rather than array indexed
     * PHP-style
     *
     * @param array $multiDimensionalArrayOfParameters
     *
     * @return string
     */
    public static function http_build_query($multiDimensionalArrayOfParameters) {
        return preg_replace('/%5B[0-9]+%5D/simU', '',
            http_build_query($multiDimensionalArrayOfParameters)
        );
    }
}