[PHP] PC(Desktop), 모바일 구분하기, 체크하기

<?php
function isMobile() {
return preg_match("/(android|avantgo|blackberry|bolt|boost|cricket|docomo|fone|hiptop|mini|mobi|palm|phone|pie|tablet|up\.browser|up\.link|webos|wos)/i", $_SERVER["HTTP_USER_AGENT"]);
}
if(isMobile()){
header("Location: http://m.yoursite.com/");
}