「PHPの学習」PHPでユーザのブラウザを取得する

PHPコード:
<?
function browse_infor()
{
$browser=””;$browserver=””;
$Browsers =array(“Lynx”,”MOSAIC”,”AOL”,”Opera”,”JAVA”,”MacWeb”,”WebExplorer”,”OmniWeb”);
$Agent = $GLOBALS[“HTTP_USER_AGENT”];
for ($i=0; $i<=7; $i++)
{
if (strpos($Agent,$Browsers[$i]))
{
$browser = $Browsers[$i];
$browserver =””;
}
}
if (ereg(“Mozilla”,$Agent) && !ereg(“MSIE”,$Agent))
{
$temp =explode(“(“, $Agent); $Part=$temp[0];
$temp =explode(“/”, $Part); $browserver=$temp[1];

$temp =explode(” “,$browserver); $browserver=$temp[0];
$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”; //powered by xujiajay
$browser = “Netscape Navigator”;
}
if (ereg(“Mozilla”,$Agent) && ereg(“Opera”,$Agent))
{
$temp =explode(“(“, $Agent); $Part=$temp[1];

$temp =explode(“)”, $Part); $browserver=$temp[1];
$temp =explode(” “,$browserver);$browserver=$temp[2];

$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”;
$browser = “Opera”;
}
if (ereg(“Mozilla”,$Agent) && ereg(“MSIE”,$Agent))

{
$temp = explode(“(“, $Agent); $Part=$temp[1];
$temp = explode(“;”,$Part); $Part=$temp[1];
$temp = explode(” “,$Part);$browserver=$temp[2];
$browserver =preg_replace(“/([d.]+)/”,”1″,$browserver);
$browserver = ” $browserver”;
$browser = “Internet Explorer”;
}
if ($browser!=””)
{
$browseinfo = “$browser$browserver”;
}
else
{
$browseinfo = “Unknown”;
}
return $browseinfo;
}
//メッソッドを呼び出す $browser=browseinfo() ;
?>