I think it is better to use explode function like this.
PHP Code:
$user = explode (" ", $_SERVER['HTTP_USER_AGENT']);
$user = explode (" ", $_SERVER['HTTP_USER_AGENT']);
One of solutions is this. 
$user = explode ('/', $_SERVER['HTTP_USER_AGENT']);
echo $user[0];
$browser = $_SERVER['HTTP_USER_AGENT'];
$browser = substr($browser, 0, 15); // will return the first 15 characters from the browser
// then do your stuff here
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