php教程 echo $_SERVER["HTTP_USER_AGENT"]; ?>
该脚本的输出可能是:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
PHP 有很多种不同类型的变量。在以上例子中我们打印了一个数组的元素。数组是一类非常有用的变量。
$_SERVER 只是 PHP 自动全局化的变量之一。您可以查阅“保留变量”一节来查看这些变量的列表,或者也可以建立如下的文件来得到一个完整的列表:
php 根据HTTP_USER_AGENT 判断用户浏览器类型
function browsers(){
global $HTTP_USER_AGENT ;
if (isset($HTTP_USER_AGENT)){
$sAgent = $HTTP_USER_AGENT;
}else{
$sAgent = $_SERVER["HTTP_USER_AGENT"];
}
if (strpos($sAgent,"MSIE") !== false && strpos($sAgent,"mac") === false && strpos($sAgent,"Opera") === false){
$iVersion = (float)substr($sAgent,strpos($sAgent,"MSIE") + 5,3);
return ($iVersion >= 5.5) ;
}else if (strpos($sAgent,"Gecko/") !== false){
$iVersion = (int)substr($sAgent,strpos($sAgent,"Gecko/") + 6,8);
return ($iVersion >= 20030210) ;
}else{
return false;
}
}
可以得到链接/提交当前页的父页面URL
if (isset($_SERVER["HTTP_REFERER"])) {
print "The page you were on previously was {$_SERVER["HTTP_REFERER"]}
";
} else {
print "You didn"t click any links to get here
";
}
?>Click me!
httprequest|HTTP_REFERER 与 HTTP_USER_AGENT的使用方法
http://m.bbyears.com/aspjiaocheng/30341.html
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