PHP获取访问者浏览器、读取文件，写入文件

PHP获取访问者浏览器代码

<?
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"; 
$browser = "Netscape Navigator"; 
} 
if (ereg("Mozilla",$Agent) && ereg("Opera",$Agent)) 
{ 
$temp =explode("(", $Agent); $Part=$temp[1]; //开源代码OSPhP.COm.CN 
$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 $browseinfo; 
} 
//调用方法$browser=browseinfo() ;直接返回结果 
?>

PHP读取文件函数

<? 
function readfromfile($file_name) { 
if (file_exists($file_name)) { //开源代码OSPhP.COm.CN 
$filenum=fopen($file_name,"r"); 
flock($filenum,LOCK_EX); 
$file_data=fread($filenum, filesize($file_name)); 
rewind($filenum); 
fclose($filenum); 
return $file_data; 
} 
} 
?> 

php写入文件函数

//写入文件函数 
<? 
function writetofile($file_name,$data,$method="w") { 
$filenum=fopen($file_name,$method); //开源OSPhP.COM.CN 
flock($filenum,LOCK_EX); 
$file_data=fwrite($filenum,$data); 
fclose($filenum); 
return $file_data; 
} 
?>