need code to display different messages based on browser or OS

[hal12b]

I am working on a few web sites and want to display certain information to users using mobile devices and everything else to people who access the site traditionally through a desktop/laptop (they'd be using IE, FireFox, Safari, etc..). The mobile users will be using Droid, and Ipod/Iphone/Ipad, and maybe blackberry and other mobile devices. My pages are in PHP. Thanks for any help.

[lammert]

The User Agent string which contains information about the used browser and OS can be accessed in PHP in the variable $_SERVER['HTTP_USER_AGENT']. Scanning this string with regular expressions which match certain browsers should do the trick.

[hal12b]

Will this tell me if they are using Safari on an Ipod/Iphone/Ipad or Safari via desktop/laptop?

[hal12b]

Maybe I should be trying to detect browser pixel size instead? Would it be safe to assume anybody with less than 400 pixels is on a mobile device, maybe except for an iPad?

[rocknbil]

You need to use Javascript to access screen resolution. You will find what you need in user agents as mentioned.

[Anyango]

As they said, User-agent string will tell you all the information required, then you can see a list of all user agent strings for comparison.