I have a website which must be opened from the browser of the mobile device to work functionally For example, when I share the website link on Snapchat (iPhone) it keeps inside the Safari View Controller!

I tried to use:

window.open('<?php echo $thelinkfull; ?>', '_blank', 'rel=nofollow noreferrer', 'modal=yes,alwaysRaised=yes,toolbar=0,location=1,scrollbars=1,statusbar=1,menubar=0,resizable=1','width=400,height=800,left=100,top=50');

But it doesn't move the user to Safari browser or any external browser and keep him inside the Snapchat App!

Even I tried to use _System & Popup, but all of them do the same. On Apple documents, they mentioned the only way is to use FTP link! But that will not be a good & secure option to use for a simple web page!

Any suggestions please?