Custom function for URL parsing

proper_parse_str.php

<?php
/**
 * Custom version of parse_str function to avoid overriding of multiple definitions in query string
 *
 * @param $string
 * @return array
 */
function proper_parse_str($string)
{
    $array = array();
    $delimiter = '?';
    // Determining string delimiter
    if (strpos($string, '?') === false) {
        $delimiter = '/';
    }
    // URL decoding and checking string length. If single query, return simple array
    $string = urldecode(substr($string, strrpos($string, $delimiter)+1));
    if (strpos($string, '=') === false) {
        $array[$string] = $string;
        return $array;
    }

    // Building query array. First explode: extracting parameters
    $pairs = explode('&', $string);
    foreach ($pairs as $pair) {
        // Second explode: getting key-value pairs from paramaters
        list($key, $value) = explode('=', $pair, 2);

        // Checking if key already exist.
        if (isset($array[$key])) {
            // If key exists
            if (is_array($array[$key])) {
                // And if it's already an array, value is added
                $array[$key][] = $value;
            } else {
                // If not, key is transformed in array and new value is added
                $array[$key] = array($array[$key], $value);
            }
        } else {
            // If key doesn't exists, key-value pair is added to master array
            $array[$key] = $value;
        }
    }
    return $array;
}