本文实例讲述了PHP实现的浏览器检查类。分享给大家供大家参考，具体如下：

<?php //原作者：epsilon7 //SonyMusic([email]sonymusic@163.net[/email]) 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>"; ?>

希望本文所述对大家PHP程序设计有所帮助。