userAgent の仕分け

userAgent の仕分け

<?php
switch($_SERVER['HTTP_USER_AGENT']){
case null:
$url='null';
break;

case 'Twitterbot/1.0':
$url='twitter';
break;

case 'facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)':
$url='facebook';
break;

default:
$url='default';
}

//header("location:{$url}");
echo '<br>';
echo $url;

?>