Regular expression to detect Internet Explorer 11

Question

I am using this preg_match string

preg_match(\'/Trident/7.0; rv:11.0/\',$_SERVER[\"HTTP_USER_AGENT\"]

to detect IE11 so I can

Answer 1

IE11 has touch versions and non-touch versions, this means that the Guilherme Sehn's answer will not work for touch devices.

if(strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0; rv:11.0') !== false)

Instead, use this:

if ( strpos($_SERVER['HTTP_USER_AGENT'], 'rv:11.0')     !== false
  && strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0;')!== false)
{
    echo "User is on IE11 touch / non-touch";
}

This is because any number of parameters could be added between "Trident" and the revision number.

Likewise if you want to check if they're on touch just do a strpos for "Touch;".