PHP search params

search-params.php

<?php


/**
 * Gets the URL search params.
 * 
 * @param string $url The URL to parse. If no URL is passed, `$_SERVER["REQUEST_URI"]` will be used instead
 * @param bool $arrays If false, search params that are added at the end will overwrite any existing values
 */
function getQuery(string $url = "", bool $arrays = true)
{
    $splittableUrl = $url === "" ? $_SERVER["REQUEST_URI"] : $url;

    $split =  explode("?", $splittableUrl);

    /**
     * Check if passed url has a text part before "?"
     */
    $hasPath = count($split) > 1;

    /**
     * Get the search query
     */
    $parseable = $hasPath ? $split[1] : $split[0];

    /**
     * This will store the query search key values
     */
    $key_values = new ArrayObject();


    /**
     * Separates search params by "&"
     */
    $withKeys = explode("&", $parseable);

    foreach ($withKeys as $wKey) {

        if (!$wKey) break;

        /**
         * Separates each search value by "="
         */
        $kv = explode("=", $wKey);

        /**
         * Ignore keys where there is no corresponding value, eg when search is "a=1&b"
         */
        if (count($kv) !== 2) break;

        [$key, $value] = $kv;

        /**
         * Decodes the current search param
         */
        $urlDecodedValue = urldecode($value);

        if ($key_values->offsetExists($key) && $arrays) {

            /**
             * Checks if current value was already merged in an array
             */
            $isCurrentValueArray = is_array($key_values->offsetGet($key));

            $arrayValue = $isCurrentValueArray ?

                /**
                 * If current value is already an array, merge existing array with new value
                 */
                array_merge($key_values->offsetGet($key), [$urlDecodedValue]) :

                /**
                 * If not an array, create a new array value with existing and new value
                 */
                [$key_values->offsetGet($key), $urlDecodedValue];

            /**
             * Finally set array value
             */
            $key_values->offsetSet($key, $arrayValue);
        } else {

            /**
             * Sets single value
             */
            $key_values->offsetSet($key, $urlDecodedValue);
        }
    }

    return $key_values;
}

Usage:

<?php
include "./utils.php";

$query = getQuery();

echo ($query["search"])