public static function is_touch()
{
// Only detect once
if (self::$touchscreen !== NULL) {
return self::$touchscreen;
}
if (($devices = self::lines(CRAYON_TOUCH_FILE, 'lw')) !== FALSE) {
if (!isset($_SERVER['HTTP_USER_AGENT'])) {
return false;
}
// Create array of device strings from file
$user_agent = strtolower($_SERVER['HTTP_USER_AGENT']);
self::$touchscreen = self::strposa($user_agent, $devices) !== FALSE;
return self::$touchscreen;
} else {
CrayonLog::syslog('Error occurred when trying to identify touchscreen devices');
}
}
