Limit AppPresser to iPhone and Android browser only

gistfile1.txt

function apppresser_limit_access_app() {

	$agents = $_SERVER['HTTP_USER_AGENT'] ;
	
	$app = false;

	$useragents = array (
		"iPhone", 
		"iPod", 
		"iPad",
		"Android"
	);
	
	foreach ( $useragents as $useragent ) {
		if ( preg_match("/".$useragent."/i", $agents ) ){
			$app = true;
		} 
	}
	
	if( !$app && !current_user_can('manage_options') ) {
		echo "You need the app!";
		exit;
	}

}
add_action( 'appp_before', 'apppresser_limit_access_app' );