IP Address Check and Compare

Hello

i want to make a php file for a download page so the same IP address cannot download the file twice

I want to make a php file that can check the IP of the visitor and if the IP already exists in a .txt file then it doesnt store it and if the IP doesnt exist then it stores it in the .txt file and then redirects the visitor to the download page

and i want the maximum IPs in the .txt file to be 4000 IPs so when it reaches 4000 IP's and a new visitor come the first IP gets deleted and the new IP is stored

i would appreciate if someone helps me

Cheers
Adel

 

It's quite an easy task for a PHP programmer. I'll quickly cook up a checking script.

 

thank you mate i am waiting

 

Asslam-o-alikam. My this code solve your problem

	$ip = trim($_SERVER['REMOTE_ADDR']);
	
	$myFile = "file/testFile.txt";	
	$fh = fopen($myFile, 'a+')or die ("fail to read the file");
	$theData = fread($fh, filesize($myFile));
	$theData = trim($theData);
	//echo $theData;	
	$savefile = explode(" ",$theData);
	
	foreach ($savefile as $value) {
	//print $value." - ". $ip."<br />"; 
    	if($value == $ip){		
			$flag = 1;
			break;
		}
		//echo $value."<br />";
	}
	if(isset($flag)){
		echo "Ip found";//now u can do what ever u want
		
	}else{
		$count = count($savefile); 
		if($count >4000){ // total number of record		
		$savefile[] = $ip; 
		$savefile = array_slice($savefile,1,$count);
		//print_r($savefile);
		$str = implode(" ",$savefile);
		$str = trim($str);
		
		$temp = "file/temp.txt";	
		$new = fopen($temp, 'w') or die("can't open file");		
		fwrite($new, $str);	
		unlink("file/testFile.txt");
		rename("file/temp.txt","file/testFile.txt");		
		}else{
			$ip = " ".$ip; 
			fwrite($fh, $ip);
		}		
		//echo "Ip not found";
	}
	
	
	fclose($fh);

PHP:

 

rafiqasad beat me to it while I was coding... but I'll still post my code cause I feel like it.

function verify_ip($log = 'ips.txt')
{
	$ips = array_map('trim', @file($log));
	
	// IP exists in file
	if (in_array($_SERVER['REMOTE_ADDR'], $ips))
	{
		return false;
	}
	
	$ips[] = $_SERVER['REMOTE_ADDR'];
	
	// Only the latest 4000 IPs
	if (sizeof($ips) > 4000)
	{
		$ips = array_slice($ips, -4000);
	}
	
	// Write data to file
	if ($fp = @fopen($log, 'w'))
	{
		flock($fp, LOCK_EX);
		fwrite($fp, implode("\n", $ips));
		flock($fp, LOCK_UN);
		fclose($fp);
	}
	
	return true;
}

PHP:

if (verify_ip())
{
	echo 'I can download';
}
else
{
	echo 'I can not download';
}

PHP:

 

thank you guys it really helped me gave + rep to you both