PHP 判斷客戶端是IOS還是Android

if(strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone')||strpos($_SERVER['HTTP_USER_AGENT'], 'iPad')){
    echo 'systerm is IOS';
}else if(strpos($_SERVER['HTTP_USER_AGENT'], 'Android')){
    echo 'systerm is Android';
}else{
    echo 'systerm is other';
}
?>

PHP、IOS、Android