php檢測useragent版本示例

 這篇文章主要介紹了php檢測useragent版本的示例,需要的朋友可以參考下

   代碼如下: <?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);