seklinde kullanabilirisniz
shortcodeda hata var sanirm
$isim = "cagritaner";
$aranacakuser = "https://www.instagram.com/$isim/?__a=1/";
preg_match('@<script type="text/javascript">window._sharedData = (.*?)</script>@si', $Baglan, $takipci);
$data = json_decode($takipci[1][0]);