一江春水向东流

<? php
// 原作者：epsilon7 
//SonyMusic(sonymusic@163.net) 
class  BrowserDetector { 
var   $UA   =   "" ;  // $HTTP_USER_AGENT的内容 
var   $BROWSER =   " Unknown " ;  // 浏览器类型 
var   $PLATFORM   =   " Unknown " ;  // 操作系统 
var   $VERSION =   "" ;  // 浏览器版本号 
var   $MAJORVER   =   "" ;  // 浏览器主版本号 
var   $MINORVER   =   "" ;  // 浏览器副版本号 
/*  构造函数开始  */  
function  BrowserDetector(){ 
$this -> UA  =   getenv (HTTP_USER_AGENT); 
$preparens   =   "" ; 
$parens   =   "" ; 
$i   =   strpos ( $this -> UA , " ( " ); 
if  ( $i   >=   0 ) { 
$preparens   =   trim ( substr ( $this -> UA , 0 , $i )); 
$parens   =   substr ( $this -> UA , $i + 1 , strlen ( $this -> UA)); 
$j   =   strpos ( $parens , " ) " ); 
if ( $j >= 0 ) { 
$parens   =   substr ( $parens , 0 , $j ); 
} 
} 
else  { 
$preparens   =   $this -> UA; 
} 
$browVer   =   $preparens ; 
$token   =   trim ( strtok ( $parens , " ; " )); 
while ( $token ) { 
if ( $token == " compatible " ) { 
} 
elseif ( preg_match ( " /MSIE/i " , " $token " )) { 
$browVer   =   $token ; 
} 
elseif ( preg_match ( " /Opera/i " , " $token " )) { 
$browVer   =   $token ; 
} 
elseif ( preg_match ( " /X11/i " , " $token " )  ||   preg_match ( " /SunOS/i " , " $token " )  ||   preg_match  ( " /Linux/i " , " $token " )) { 
$this -> PLATFORM  =   " Unix " ; 
} 
elseif ( preg_match ( " /Win/i " , " $token " )) { 
$this -> PLATFORM  =   $token ; 
} 
elseif ( preg_match ( " /Mac/i " , " $token " )  ||   preg_match ( " /PPC/i " , " $token " )) { 
$this -> PLATFORM  =   $token ; 
} 
$token   =   strtok ( " ; " ); 
} 
$msieIndex   =   strpos ( $browVer , " MSIE " ); 
if ( $msieIndex   >=   0 ) { 
$browVer   =   substr ( $browVer , $msieIndex , strlen ( $browVer )); 
} 
$leftover   =   "" ; 
if ( substr ( $browVer , 0 , strlen ( " Mozilla " ))  ==   " Mozilla " ) { 
$this -> BROWSER  =   " Netscape " ; 
$leftover = substr ( $browVer , strlen ( " Mozilla " ) + 1 , strlen ( $browVer )); 
} 
elseif ( substr ( $browVer , 0 , strlen ( " Lynx " ))  ==   " Lynx " ) { 
$this -> BROWSER  =   " Lynx " ; 
$leftover = substr ( $browVer , strlen ( " Lynx " ) + 1 , strlen ( $browVer )); 
} 
elseif ( substr ( $browVer , 0 , strlen ( " MSIE " ))  ==   " MSIE " ) { 
$this -> BROWSER  =   " IE " ; 
$leftover = substr ( $browVer , strlen ( " MSIE " ) + 1 , strlen ( $browVer )); 
} 
elseif ( substr ( $browVer , 0 , strlen ( " Microsoft Internet Explorer " ))  ==   " Microsoft Internet Explorer " ) { 
$this -> BROWSER  =   " IE " ; 
$leftover = substr ( $browVer , strlen ( " Microsoft Internet Explorer " ) + 1 , strlen ( $browVer )); 
} 
elseif ( substr ( $browVer , 0 , strlen ( " Opera " ))  ==   " Opera " ) { 
$this -> BROWSER  =   " Opera " ; 
$leftover = substr ( $browVer , strlen ( " Opera " ) + 1 , strlen ( $browVer )); 
} 
$leftover   =   trim ( $leftover ); 
$i = strpos ( $leftover , "   " ); 
if ( $i   >   0 ) { 
$this -> VERSION  =   substr ( $leftover , 0 , $i ); 
} 
else  { 
$this -> VERSION  =   $leftover ; 
} 
$j   =   strpos ( $this -> VERSION , " . " ); 
if ( $j   >=   0 ) { 
$this -> MAJORVER  =   substr ( $this -> VERSION , 0 , $j ); 
$this -> MINORVER  =   substr ( $this -> VERSION , $j + 1 , strlen ( $this -> VERSION)); 
} 
else  { 
$this -> MAJORVER  =   $this -> VERSION; 
} 
} 
} 

// 测试程序开始 
$test = new  browserdetector; 
echo   $test -> UA . " <br> " ; 
echo   $test -> BROWSER . " <br> " ; 
echo   $test -> PLATFORM . " <br> " ; 
echo   $test -> VERSION . " <br> " ; 
echo   $test -> MAJORVER . " <br> " ; 
echo   $test -> MINORVER . " <br> " ; 
?>