Detect webview with PHP ios

i know this question been asked a lot and i searched before but was not able to find a way to detect ios webview in php

react native app that on an app page i use webview and i want to display some information when this webpage is loaded from my react native app

for android i have done it like this and it work

if($_SERVER['HTTP_X_REQUESTED_WITH'] == "com.appp.app") 

now for ios $_SERVER['HTTP_X_REQUESTED_WITH return null

i have tried

$_SERVER['HTTP_USER_AGENT']

other answers found here was not able to set only for app it is also detect safari

i need only to detect app

thanks for the help