＆更改为％26和=至％3D

I have a form that returns link on filter

<div class="item" style="float:right">
    <form class="ui icon input" name="search" action="" method="GET">   
        <input type="hidden" name="view" value="&user_id=156">                  
        <input type="search" name="filter" style="width:10em;" placeholder="Filter..">
        <i class="filter icon"></i>
    </form>
</div>

But it turns & in %26 and = to %3D

I tried encode but it did not worked! Please help

Tried :

        $query_string = 'objects&user_id=156';
        $a = urldecode($query_string);      

<?php
    $query_string = 'objects%26user_id%3D156';
    $a = urldecode($query_string);
    var_dump($a);

remove var_dump after test