smart tv user agent

php

<?php
function is_smarttv()
{
    $user_agent = strtolower($_SERVER['HTTP_USER_AGENT']);
    if (strpos($user_agent, 'smart-tv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'smarttv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'tv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'googletv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'appletv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'hbbtv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'pov_tv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'netcast') !== false) {
        return true;
    } elseif (strpos($user_agent, 'viera') !== false) {
        return true;
    } elseif (strpos($user_agent, 'nettv') !== false) {
        return true;
    } elseif (strpos($user_agent, 'maple') !== false) {
        return true;
    } elseif (strpos($user_agent, 'espial') !== false) {
        return true;
    } elseif (strpos($user_agent, 'inettvbrowser') !== false) {
        return true;
    } else {
        return false;
    }
}