function browser_detection( $which_test ) { // initialize the variables $browser = ''; $dom_browser = ''; // set to lower case to avoid errors, check to see if http_user_agent is set $navigator_user_agent = ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) ? strtolower( $_SERVER['HTTP_USER_AGENT'] ) : ''; // run through the main browser possibilities, assign them to the main $browser variable if (stristr($navigator_user_agent, "opera")) { $browser = 'opera'; $dom_browser = true; } elseif (stristr($navigator_user_agent, "msie 4")) { $browser = 'msie4'; $dom_browser = false; } elseif (stristr($navigator_user_agent, "msie")) { $browser = 'msie'; $dom_browser = true; } elseif ((stristr($navigator_user_agent, "konqueror")) || (stristr($navigator_user_agent, "safari"))) { $browser = 'safari'; $dom_browser = true; } elseif (stristr($navigator_user_agent, "gecko")) { $browser = 'mozilla'; $dom_browser = true; } elseif (stristr($navigator_user_agent, "mozilla/4")) { $browser = 'ns4'; $dom_browser = false; } else { $dom_browser = false; $browser = false; } // return the test result you want if ( $which_test == 'browser' ) { return $browser; } elseif ( $which_test == 'dom' ) { return $dom_browser; // note: $dom_browser is a boolean value, true/false, so you can just test if // it's true or not. } }