php检测useragent版本示例

复制代码 代码如下:
<?php
define("IE", 1);
define("FIREFOX", 2);
define("CHROME", 3);
define("OPERA", 4);
class UserAgentDetect
{
    static $version = array();

    static $userAgent = "";

    static function getUserAgent()
    {
        $header = getallheaders();
        self :: $userAgent = $header["User-Agent"];
    }
  function findUserAgentByKey($ua, $key)
    {
        $len = strlen($key);
        $start = strpos($ua, $key);

        $pos = strpos($ua, " ", $start + $len + 1);

        return substr($ua, $start + $len, $pos - $len - $start);
    }
    static function detectUserAgent()
    {
         self :: getUserAgent();

        if (strpos(self :: $userAgent, "MSIE") != null)
        {
            self :: $version[] = IE;
            self :: $version[] =self:: findUserAgentByKey(self :: $userAgent, "MSIE");
        }
        else if (strpos(self :: $userAgent, "Gecko/") != null)
        {            self :: $version[] = FIREFOX;
            self :: $version[] =self::  findUserAgentByKey(self :: $userAgent, "Firefox/");
        }
        else if (strpos(self :: $userAgent, "AppleWebKit/") != null)
        {
            self :: $version[] = CHROME;
            self :: $version[] = self:: findUserAgentByKey(self :: $userAgent, "Chrome/");
        }
        else if (strpos(self :: $userAgent, "Presto/") != null)
        {
            self :: $version[] = OPERA;
            self :: $version[] = self:: findUserAgentByKey(self :: $userAgent, "Opera/");
        }
        else
        {
        }

        return self :: $version;
    }

    function matchUserAgent($ua, $key)
    {
        preg_match("/$key.([^s]*?)s/", $ua, $out);

        return $out[1];
    }
}
$ua=UserAgentDetect::detectUserAgent();

print_r($ua);