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PHP code to record visitor IP address

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Release： 2016-07-25 09:07:35

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//File name
$filename = "ip.txt";
if (isset($_SERVER['HTTP_CLIENT_IP']))
{
$clientip = $_SERVER['HTTP_CLIENT_IP' ];
}elseif (isset($_SERVER['HTTP_X_FORWARD_FOR']))
{
$clientip = $_SERVER['HTTP_X_FORWARD_FOR'];
}else
{
$clientip = $_SERVER['REMOTE_ADDR'];
}
//Open the file (the file does not exist and will be created automatically)
if (!$fp = fopen($filename, "a+"))
{
echo "Cannot open file$";
exit;
}
//Write It also determines whether there is duplicate data
while(!feof($fp))
{
$line = fgets($fp);
if($line == ($clientip."n"))
{
exit; //Exit if there is duplicate data;
}
}
//Write to file
if(!fwrite($fp,$clientip."n"))
{
echo "Cannot write to file $filename" ;
exit;
}
//Writing to file has been completed
fclose($fp);
?>

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php记录访问者IP地址的代码

source：php.cn

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