php - how to redirect parent iframe from child window? -

after spending whole day searching , trying ways implement this, end asking here, hope i'll want achieve. know issue not question still bear me.

problem - using google oauth contacts of user, setup, flow of application is

user clicks on button -> modal appears has iframe (gmail_connect.php) has link user authorized -> when clicked on link opening  popup in authorizing user -> when user authorized -> user redirected contacts.php in popup window -> have  written js in contacts.php close , reload iframe  window opened contacts.php parameters. 

following 2 lines have written in contacts.php closes itself(popup window) , sets location of parent iframe url popup window has.

<?php    $oauth_verifier = $_get['oauth_verifier'];    $oauth_token = $_get['oauth_token']; ?> <script> window.opener.location.href = 'contacts.php?oauth_verifier=<?= $oauth_verifier?>&oauth_token=<?= $oauth_token;?>'; window.close(); <script> 

the problem 404 error, , thats obvious because when check url of iframe, url is

<a href="http://localhost/contacts.php%3foauth_verifier=f2hktklnseza7-2hc1ii-7kq&amp;oauth_token=4%252filq0z3ivykfsdpuoqqe_rgbh2zbi">referring page</a> 

you can see %3f instead of ? , & instead of &

why happening?