php：获取浏览器的版本信息

//分析返回用户网页浏览器名称，返回的数组第一个为浏览器名称，第二个是版本号。

 function  getBrowser() {
     $sys  =  $_SERVER [ 'HTTP_USER_AGENT' ];
     if  ( stripos ( $sys ,  "NetCaptor" ) > 0) {
         $exp [0] =  "NetCaptor" ;
         $exp [1] =  "" ;
     }  elseif  ( stripos ( $sys ,  "Firefox/" ) > 0) {
         preg_match( "/Firefox\/([^;)]+)+/i" ,  $sys ,  $b );
         $exp [0] =  "Mozilla Firefox" ;
         $exp [1] =  $b [1];
     }  elseif  ( stripos ( $sys ,  "MAXTHON" ) > 0) {
         preg_match( "/MAXTHON\s+([^;)]+)+/i" ,  $sys ,  $b );
         preg_match( "/MSIE\s+([^;)]+)+/i" ,  $sys ,  $ie );
         // $exp = $b[0]." (IE".$ie[1].")";
         $exp [0] =  $b [0] .  " (IE"  .  $ie [1] .  ")" ;
         $exp [1] =  $ie [1];
     }  elseif  ( stripos ( $sys ,  "MSIE" ) > 0) {
         preg_match( "/MSIE\s+([^;)]+)+/i" ,  $sys ,  $ie );
         //$exp = "Internet Explorer ".$ie[1];
         $exp [0] =  "Internet Explorer" ;
         $exp [1] =  $ie [1];
     }  elseif  ( stripos ( $sys ,  "Netscape" ) > 0) {
         $exp [0] =  "Netscape" ;
         $exp [1] =  "" ;
     }  elseif  ( stripos ( $sys ,  "Opera" ) > 0) {
         $exp [0] =  "Opera" ;
         $exp [1] =  "" ;
     }  elseif  ( stripos ( $sys ,  "Chrome" ) > 0) {
         $exp [0] =  "Chrome" ;
         $exp [1] =  "" ;
     }  else  {
         $exp  =  "未知浏览器" ;
         $exp [1] =  "" ;
     }
     return  $exp ;
 }

 //检测浏览器，如果为IE6及以下的，就跳转页面
 function  check_browser(){
     $ie_array  = getBrowser();
     if ( $ie_array [0]== 'Internet Explorer'  &&  $ie_array [1] <= 6){
         include  './template/default/common/show_ie_out.htm' ;
         //header("Location: ./template/default/common/show_ie_out.htm");
         exit ();
     }
 }