<?php

// via bit.ly/wpthemg-bodclass   
 
/**
 * Extends the body_class(); to include browser detection
 * Props to Thematic: http://wordpress.org/extend/themes/thematic
 */
 
function browser_body_class($classes) {
 
    // A little Browser detection shall we?
    $browser = $_SERVER[ 'HTTP_USER_AGENT' ];
 
    // Mac, PC ...or Linux
    if ( preg_match( "/Mac/", $browser ) ){
        $classes[] = 'mac';
 
    } elseif ( preg_match( "/Windows/", $browser ) ){
        $classes[] = 'windows';
 
    } elseif ( preg_match( "/Linux/", $browser ) ) {
        $classes[] = 'linux';
 
    } else {
        $classes[] = 'unknown-os';
    }
 
    // Checks browsers in this order: Chrome, Safari, Opera, MSIE, FF
    if ( preg_match( "/Chrome/", $browser ) ) {
        $classes[] = 'chrome';
 
        preg_match( "/Chrome\/(\d.\d)/si", $browser, $matches);
        $classesh_version = 'ch' . str_replace( '.', '-', $matches[1] );
        $classes[] = $classesh_version;
 
        } elseif ( preg_match( "/Safari/", $browser ) ) {
            $classes[] = 'safari';
 
            preg_match( "/Version\/(\d.\d)/si", $browser, $matches);
            $sf_version = 'sf' . str_replace( '.', '-', $matches[1] );
            $classes[] = $sf_version;
 
         } elseif ( preg_match( "/Opera/", $browser ) ) {
            $classes[] = 'opera';
 
            preg_match( "/Opera\/(\d.\d)/si", $browser, $matches);
            $op_version = 'op' . str_replace( '.', '-', $matches[1] );
            $classes[] = $op_version;
 
         } elseif ( preg_match( "/MSIE/", $browser ) ) {
            $classes[] = 'msie';
 
            if( preg_match( "/MSIE 6.0/", $browser ) ) {
                $classes[] = 'ie6';
            } elseif ( preg_match( "/MSIE 7.0/", $browser ) ){
                $classes[] = 'ie7';
            } elseif ( preg_match( "/MSIE 8.0/", $browser ) ){
                $classes[] = 'ie8';
            } elseif ( preg_match( "/MSIE 9.0/", $browser ) ){
                $classes[] = 'ie9';
            }
 
            } elseif ( preg_match( "/Firefox/", $browser ) && preg_match( "/Gecko/", $browser ) ) {
                $classes[] = 'firefox';
 
                preg_match( "/Firefox\/(\d)/si", $browser, $matches);
                $ff_version = 'ff' . str_replace( '.', '-', $matches[1] );
                $classes[] = $ff_version;
 
            } else {
                $classes[] = 'unknown-browser';
            }
 
    return $classes;
}
 
add_filter('body_class','browser_body_class');
 
?>

http://bit.ly/wpthemg-bodclass

WordPress extended body class

class, php, wordpress, body

PHP