WordPress - Dynamic Browser Body Classes

body-classes.php

/*-----------------------------------------------------------------------------------*/
/* Adds new body classes
/*-----------------------------------------------------------------------------------*/
add_filter('body_class', 'add_browser_classes');
function add_browser_classes($classes){

    if(is_singular()) {
      global $post;
      $classes[] = $post->post_name;
    }

    //add browser 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;
}