判断客户端的浏览器类型-PHP源码

/**
 * 判断浏览器名称和版本
 */
function get_user_browser()
{
    if (empty($_SERVER[&＃39;HTTP_USER_AGENT&＃39;]))
    {
        return &＃39;&＃39;;
    }

    $agent       = $_SERVER[&＃39;HTTP_USER_AGENT&＃39;];
    $browser     = &＃39;&＃39;;
    $browser_ver = &＃39;&＃39;;

    if (preg_match(&＃39;/MSIE\s([^\s|;]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;Internet Explorer&＃39;;
        $browser_ver = $regs[1];
    }
    elseif (preg_match(&＃39;/FireFox\/([^\s]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;FireFox&＃39;;
        $browser_ver = $regs[1];
    }
    elseif (preg_match(&＃39;/Maxthon/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;(Internet Explorer &＃39; .$browser_ver. &＃39;) Maxthon&＃39;;
        $browser_ver = &＃39;&＃39;;
    }
    elseif (preg_match(&＃39;/Opera[\s|\/]([^\s]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;Opera&＃39;;
        $browser_ver = $regs[1];
    }
    elseif (preg_match(&＃39;/OmniWeb\/(v*)([^\s|;]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;OmniWeb&＃39;;
        $browser_ver = $regs[2];
    }
    elseif (preg_match(&＃39;/Netscape([\d]*)\/([^\s]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;Netscape&＃39;;
        $browser_ver = $regs[2];
    }
    elseif (preg_match(&＃39;/safari\/([^\s]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;Safari&＃39;;
        $browser_ver = $regs[1];
    }
    elseif (preg_match(&＃39;/NetCaptor\s([^\s|;]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;(Internet Explorer &＃39; .$browser_ver. &＃39;) NetCaptor&＃39;;
        $browser_ver = $regs[1];
    }
    elseif (preg_match(&＃39;/Lynx\/([^\s]+)/i&＃39;, $agent, $regs))
    {
        $browser     = &＃39;Lynx&＃39;;
        $browser_ver = $regs[1];
    }

    if (!empty($browser))
    {
       return addslashes($browser . &＃39; &＃39; . $browser_ver);
    }
    else
    {
        return &＃39;Unknow browser&＃39;;
    }
}